Note: everything here is taken from public sources. If you have more information, it would be welcome, but please send a public URL to be cited. This information is presented differently at the "w23 Digital Release and Speculation Thread" on the Steve Jackson Games forums.

The usual progression is roughly:

• Query/Proposal
• Contracted/Outline
• First Draft (usually the first announcement)
• Playtesting/Review
• Final Draft
• Editing
• Art/Layout ("in production" from here on)
• Indexing/Proofing/Prepress Checking
• Published

• GURPS Infinite Worlds Nightreign (by James Amaral and Joshua Lopez)
  January 2022: Art/Layout
  art approved
  [ in editing; in production; art approved ]
• Dungeon Fantasy Denizens Thieves (by Christopher Rice)
  November 2021: Editing
  final draft in
  [ playtest in progress; final draft in ]
• GURPS Vehicles Biremes and Triremes (by Carolyn Stein and Steve Stein)
  November 2021: Editing
  final draft in
  [ received first draft for item in the Vehicles series.; First draft with authors for revisions; Final draft with authors; final draft in ]
• unnamed GURPS Hot Spots volume (by Matt Riggsby)
  November 2021: First Draft
  With author to write first draft. First-draft deadline March 4, 2019.
  [ With author to write first draft. First-draft deadline March 4, 2019. ]
• unknown Fantasy Folk item (by Phil Masters)
  October 2021: First Draft
  awaiting playtest
  [ awaiting playtest ]
• unknown Fantasy Folk item (by Phil Masters)
  October 2021: First Draft
  awaiting editorial review
  [ awaiting editorial review ]
• unknown Fantasy Folk item (by Anders Starmark)
  October 2021: First Draft
  awaiting playtest
  [ awaiting playtest ]
• unknown Loadouts item (by Paul Stefko)
  October 2021: First Draft
  pre-playtest revision
  [ pre-playtest revision ]
• DF Denizens item, formerly Marl Ankh-3 (by Christopher Rice)
  February 2021: Playtesting/Peer Review/Staff Review
  continues to receive loving revisions from the author
  [ Signed a contract for another item in the DF Denizens sub series.; is being edited and revised, currently at the 23% mark. Jan deadline is well within reach.; Editing and being revised, about 77% mark. Jan deadline well within reach.; First draft arrived in house and waiting editorial review.; Qued for playtesting; continues to receive loving revisions from the author ]
• Unknown (by Kromm)
  February 2021: Indexing/Proofing/Prepress Checking
  with author for final review
  [ Started writing another short item; Most recent item is twice as long as last week and almost done.; Finished and sent to production, Expect in April; with author for final review ]
• Unknown Dungeon Fantasy item (by Kromm)
  February 2021: Entered the Pipeline/Outline
  something sinister
  [ another short item; something sinister ]
• GURPS Realm Management (by Christopher Rice)
  February 2021: Art/Layout
  received art and entered production review, March perhaps?
  [ Has a signed contract, on the backburner for a bit while work on smaller projects; I began brainstorming some more on my bigger GURPS project (which I'm going to call 'SNO-51' from now on) and doing some more outline work. Lots of red string. Lots of index cards. I think it'll prove rather interesting to some gamers.; I outlined and contracted a new GURPS volume. Codenamed "SNO-51" this is something gamers have asked for repeatedly, but has not yet been done for GURPS.; finished the first draft.; Playtest call and title announced; Playtest over and Final Draft on target for April; Sent to production; received art and entered production review, March perhaps? ]
• The Mostly Kromm Rumors Section (by Steve Jackson Games)
  January 2021: Entered the Pipeline/Outline
  review4d two promising new proposals
  [ Approved 1 project, reviewed another, and have a few in the wind. Trying to kick off the New Year by getting new material into the pipeline.; Approved a new proposal; 12 first drafts in progress!; Several ultra-short drafts have leapt into the Production queue, including volumes for GURPS Boardroom and Curia, GURPS Dungeon Fantasy, GURPS Monster Hunters, and GURPS Steampunk.; Reviewed a draft of in the Fantasy Folk series; review4d two promising new proposals ]
• unknown (by William Stoddard)
  January 2021: Entered the Pipeline/Outline
  Another item by Bill Stoddard his latest entered peer review
  [ Another item by Bill Stoddard his latest entered peer review ]
• Unknown (by William Stoddard)
  January 2021: Playtesting/Peer Review/Staff Review
  Revised draft arrived and slid into playtest queue
  [ New contract signed.; Revised draft arrived and slid into playtest queue ]
• Unkown (by Rory Fansler)
  October 2020: First Draft
  Somethng mystical
  [ Signed new contract since May; First draft arrived and queued for editing; started and finished review of first draft; Somethng mystical ]
• Infinite Worlds setting (by James Amaral and Joshua Lopez)
  October 2020: Playtesting/Peer Review/Staff Review
  queued for playtesting
  [ First draft arrived in house and waiting editorial review.; Queued for playtesting; Continued review of first draft though with minimal progress due to other work; Second draft arrived and is in the playtest queue; queued for playtesting ]
• Fantasy Folk Elves (by Alden Loveshade)
  September 2020: Playtesting/Peer Review/Staff Review
  queued for playtesting
  [ First draft has arrived; queued for playtesting ]
• GURPS Furries (by William Stoddard)
  September 2020: Editing
  queued for editing
  [ Contract sent in and signed. Book been thinking about a long time.; First draft in. A followup of sorts to a previous project, with a large bibliography.; Started review of most recent revised draft.; With author for revision; Qued for playtesting; Waiting for author to finish cross country move before starting play test; Playtesters call; queued for editing ]
• Unknown GURPS item Volume 1 (by David Pulver)
  April 2020: Art/Layout
  First Draft arrived
  [ I'm not doing anything called Template Toolkit, though besides the TFT stuff and GURPS Vehicle Design, and one of the books in the Indefinite Hold section, I do have two other non-TFT books not mentioned in the list that I'm working on.; Volume 1 With author to write first draft. First-draft deadline April 29, 2019.; One item in first draft.; First Draft arrived ]
• DF Nordlander Bestiary (by Douglas Cole)
  September 2019: Entered the Pipeline/Outline
  A bestiary for the Nordland setting
  [ A bestiary for the Nordland setting ]
• Calypso-4 a TFT adventure 'Five Perilous Journeys' with J Edward Tremlett (by Christopher Rice)
  August 2019: First Draft
  Adventure 4 should be done by mid August, has some art and hopefully last written in Oct.
  [ Calypso-4 is two fifths of the way turned in with my writing partner J. Edward Tremlett currently working on number three. Were shooting for finished work by August 1 that is basically one adventure per month. We can do that.; Adventure 4 should be done by mid August, has some art and hopefully last written in Oct. ]
• TFT adventure Group 1 (by Douglas Cole)
  May 2019: First Draft
  Kickstarter launched
  [ crowdfund in April PDF in June Print starts in Sept. This is a batch of 4 adventures; Kickstarter launched ]
• GURPS Tactical Shooting Extreme Conditions (by Hans-Christian Vortisch)
  February 2019: Final Draft
  With author for final draft
  [ a serialized version of one of his past publications; an expansion to Tactical Shooting; started review on first draft; first draft review done; title released, playtest solicited; playtest complete; post-playtest revision; still working on final draft; still working on final draft; With author for final draft ]
• Unknown GURPS item Volume 2 (by David Pulver)
  February 2019: Entered the Pipeline/Outline
  Volume 2 With author to write first draft. First-draft deadline June 3, 2019.
  [ I do have two other non-TFT books not mentioned in the list that I'm working on.; Volume 2 With author to write first draft. First-draft deadline June 3, 2019. ]
• TFT adventure Group 2 (by Douglas Cole)
  January 2019: Entered the Pipeline/Outline
  crowdfund in Oct PDF in Dec Print run starts in March. This is a batch of 4 adventures
  [ crowdfund in Oct PDF in Dec Print run starts in March. This is a batch of 4 adventures ]
• The Gaming Ballistic Rumors Section (by Douglas Cole)
  January 2019: Entered the Pipeline/Outline
  Short Nordlond-based supplement 2 is in planning to be written by Doug
  [ Reached agreement to produce from 4 to 10 TFT adventures in PDF. Three full length (64-128 page) Nordlond adventures/mini-settings for the Dungeon Fantasy RPG; Planned release schedule for 2019; Citadel at Nordvorn and DF item Dungeon Grappling (Fantastic Dungeon Grappling) both shipped a while ago.; Nordlondr Folk and Hand of Asgard prepress file shipped in Dec 2019, final files due in Feb 2020.; Forest's End (96 page setting/adventure) is in Art/Layout and will go to print in Feb 2020; Dragons of Rosgarth is in editing, will go to print Feb 2020 as well.; TFT Adventure Group 1 finished fulfillment in December 2019.; TFT Adventure Group 2 expected to hit crowdfunding in late Q12020. This pushes out the dates from the "pipeline" section by quite a bit, but is realistic.; Nordlondr Bestiary is a late 2020 item.; Short Nordlond-based supplement 1 is in discussion with author; Short Nordlond-based supplement 2 is in planning to be written by Doug ]
• GURPS Armourer's Handbook (by unknown)
  January 2019: On Indefinite Hold/Rumor/Unknown/Vaporware
  working on one of the books in the Indefinite Hold section.
  [ while the title is known it's still 'vaporware'; might see a release near Vehicle Design; working on one of the books in the Indefinite Hold section. ]
• Unnamed Project (by unknown)
  January 2019: On Indefinite Hold/Rumor/Unknown/Vaporware
  working on one of the books in the Indefinite Hold section.
  [ A book about what to do in your vehicle (vs. vehicle design). Tentative titles: GURPS Vehicle Action or GURPS Vehicles in Action as seen here; working on one of the books in the Indefinite Hold section. ]
• TFT adventure item (by Unknown author)
  January 2019: Editing
  in editing
  [ in editing ]
• TFT adventure item (by Unknown)
  January 2019: Editing
  In editing
  [ In editing ]
• GURPS Vehicle Design (by David Pulver)
  May 2018: On Indefinite Hold/Rumor/Unknown/Vaporware
  staff confirmation and discussion about the manuscript. Do not expect this anytime soon
  [ Being discussed by Kromm as of January 7th, 2011; major revised draft undergoing extensive playtest and multiple revisions as of December 30th, 2010; final draft in early 2011 probable; final problems solved and possible book expected in mid-2013; needs 3-4 weeks of time; David Pulver plans on "devoting time" to this book; David has been advised on style issues; has seen more progress; David has sent in a near finished draft; has seen some movement; has lurched forward some; still being revised; David Pulver posted manuscript submitted late 2017; staff confirmation and discussion about the manuscript. Do not expect this anytime soon ]
• GURPS Bestiary (by unknown)
  February 2016: On Indefinite Hold/Rumor/Unknown/Vaporware
  coming quite soon
  [ March 19th, 2010: "the wheel turned another few degrees on GURPS Bestiary this week. It isn't just parked"; made more progress on 4/30/10; coming quite soon ]
• Unknown GURPS 4th edition conversion (by Jason "PK" Levine)
  December 2013: On Indefinite Hold/Rumor/Unknown/Vaporware
  Unverified speculation this is a conversion of All in a Night's Work
  [ probably unknown item in prepress as of January GURPS News; edited draft submitted as of March 25th, 2011; Unverified speculation this is a conversion of All in a Night's Work ]
• GURPS IST (by Bob Schroeck)
  On Indefinite Hold/Rumor/Unknown/Vaporware
  is tentative, but looks like its in the pipeline
  [ is tentative, but looks like its in the pipeline ]