Just another week Indeed, time to saddle the horse... into the forum.

Edit: spotted & added: Thanks, GoG! Nice feature addition to the announcement, to save us a few mouse clicks or an Internet search.
Might want to decorate it into a `<<spoiler>>`, to not break the UX of the hint hunters.

That's not really new anymore.
They do that for quite some time now (since March?).
Though only for their own sales (weekend, weekly, midweek, etc).

• $2.49 • -75% • Depths of Peril
• $4.99 • -75% • Drox Operative
• $9.49 • -50% • Fabled Lands
• $9.89 • -67% • Interstellar Space: Genesis
• $14.99 • -25% • Drox Operative 2

Argh, got confused by "News" before "art", it seems.

I've checked and there were 3 updates for this list since the sale started.

At some point I've dropped posting updates, because GOG is making terrible mess. Every day a few sales are updated and every day some sale expires and part of games is moved to some other sale, usually with exactly the same discount. There is no easy way to distinguish between real changes and those messy mixes, so at some point I've dropped the effort to track updates. It's just too much posting – both for me and for you. Sorry, if you think otherwise.

I agree that in this specific case it look terrible, because the sale has been simply launched incomplete.

The current offer list is the following.
• $1.99 • -75% • Alt-Frequencies
• $2.49 • -75% • Depths of Peril
• $2.49 • -75% • Din's Curse
• $2.49 • -75% • Mount and Blade
• $2.49 • -75% • Mount and Blade: With Fire and Sword
• $4.39 • -45% • Machinika Museum
• $4.99 • -75% • Drox Operative
• $4.99 • -75% • Mount and Blade: Warband
• $4.99 • -75% • Zombasite
• $8.44 • -35% • Mari and Bayu - The Road Home
• $8.99 • -40% • Letters - a written adventure
• $9.09 • -30% • Bibots
• $9.09 • -35% • Ruggnar
• $9.49 • -50% • Fabled Lands
• $9.89 • -67% • Interstellar Space: Genesis
• $9.99 • -50% • Din's Legacy
• $10.39 • -20% • Outshine
• $10.99 • -45% • Hellslave
• $12.99 • -35% • Skabma - Snowfall
• $13.69 • -24% • Letters - Collector's Edition
• $14.99 • -25% • Drox Operative 2
• $17.49 • -50% • Xuan-Yuan Sword VII
• $22.49 • -10% • Clash II
• $39.99 • -20% • Mount and Blade II: Bannerlord
• $47.99 • -20% • Mount and Blade II: Bannerlord - Digital Deluxe

I don't. I can imagine the hassle.

I guess I just caught the sale after its first update when the rest of the games mentioned in the OP were added, so it looked to me like you posted an incomplete list.