New game:

Saints Row IV: Re-Elected AU

EDIT: The game has been removed from the store for now.

EDIT 2: The game is probably seen by Australia users only and the news post showed up a while later.

So Aussies get their (censored) version I guess. Without even the benefit of the discount that the regular game now has.

It's probably region locked outside of AU since the news post is still up.

New demo:

The Supper: New Blood Demo

New games:

Dead Season
Flipon
Spin Hero

New DLC and new editions:

Kingdom Two Crowns: Call of Olympus
Kingdom Two Crowns: Essentials Edition
Kingdom Two Crowns: Olympus Edition

EDIT: Respective news posts for Dead Season, Flipon, Spin Hero and Kingdom Two Crowns showed up a while later.

New edition (not mentioned in this post):

The Lamplighters League - Deluxe Edition

New DLCs:

The Excavation of Hob's Barrow - Art Book
The Excavation of Hob's Barrow - Official Soundtrack

New bundle:

Europa Universalis IV: Ultimate Bundle

https://www.gog.com/forum/general/now_available_drake_of_the_99_dragons (https://www.gogdb.org/product/1926206120)

Announced here:
https://www.gog.com/en/news/back_to_00_promo_is_here

So it was. That's the worst placement for a new game announcement ever... They've been in promos before -- but these promos were labeled 'and new stuff' in some way front and center. This is, well, it may just as well be unannounced.

Agreed.

Tomb Raider IV-VI Remastered (Pre-Order)

New demo:

An Amazing Wizard Demo

New game, edition and DLCs:

The Inquisitor
The Inquisitor - Deluxe Edition
The Inquisitor - Deluxe Edition Upgrade
The Inquisitor - Original Soundtrack

New DLC (not mentioned in this post):

The Talos Principle 2 Digital Artbook

New DLC:

Hundred Days (Original Game Soundtrack)

EDIT: Respective news posts for The Inquisitor and Hundred Days DLC showed up a while later.