I got five, one of which no one's reported that I've seen:
Sunless Sea (the new one)
Age of Wonders III
The Bard's Tale
Lure of the Temptress
King's Bounty: Warriors of the North

From MaGog's logs for 20 April:

I quickly reprogrammed MaGog to check the 13 flags I got:
- Age of Wonders 3
- Bard's Tale
- Deponia 3
- Guilty Gear Isuka
- King's Bounty: Warriors of the North
- Lure of the Temptress
- Mount & Blade: Warband
- Outcast 1.1
- Pixel Piracy
- Settlers 2 Gold
- Shadowgate
- Tales of Maj'Eyal
- Vertical Drop Heroes HD

I can confirm that not a single one of them has changed recently (i.e. since the last time MaGog has reported a change in their files). That said, all of these games have changed sometime in the last month or so, so if you haven't kept up with MaGog's reports, there might be something there for you.

P.S. Hopefully, this will not trigger an IP block later today.

I think the system finally coughed up a hairball. These must be from when we weren't getting updates.

Quick question, if/when a game gets removed, does gog re-do all the installers that have that specific removed games picture (shown during installation process)?

Or are my 10 mysterious updates today something else?

1) No
2) Today's update flags are for games that changed sometime in the last month (not today) and for which you probably got no flag when they did

Oh hey update notifications work again! I just got 4

25 flags for me, some games have been updated in last month, but some of them probably not, not shure...

AGE OF WONDERS 3
ALBEDO: EYES FROM OUTER SPACE
BARD'S TALE, THE
BLACKGUARDS 2
DEPONIA 3: GOODBYE DEPONIA
HAND OF FATE
HOTLINE MIAMI 2: WRONG NUMBER
JOURNEYMAN PROJECT 1: PEGASUS PRIME, THE
KING'S BOUNTY: WARRIORS OF THE NORTH
LURE OF THE TEMPTRESS
MOUNT & BLADE: WARBAND
OUTCAST 1.1
OUTLAWS + A HANDFUL OF MISSIONS
PIXEL PIRACY
SANCTUARY RPG: BLACK EDITION
SHADOWGATE
SHELTER 2
STARPOINT GEMINI 2
SUNLESS SEA
TALES OF MAJ'EYAL
THE DIG®
THE ESCAPISTS
TRAIN FEVER
TRI: OF FRIENDSHIP AND MADNESS
VERTICAL DROP HEROES HD

2.5.0.5 is about a month old.

Gives a good timeline on how long GOG's been screwing with my account, then.
Didn't get any update notices for weeks, then they all pop up at once. Go figure.

I see you have a sense of humour.

Is there a point in my writing a follow-up email to the reply I got to my previous support ticket on this matter? Month old update flags are just too funny for words and without MaGog we are pretty much left in the dark about what exactly has changed.

11 flags during the night. O_o

Train Fever
Starpoint Gemini 2
Europa Universalis: Rome
The Dig

are the only ones I'm not sure about.
Will have to check my backup.
Another glitch, Gog? Please fix soon!

Got a flag for Sanctuary RPG, is there actually an update?

Finished checking all my flags. I had 11 flags:

Tales of Maj'Eyal, Shadowgate, King's Bounty: Warriors of the North, Pixel Piracy, Mount & Blade: Warband, Vertical Drop Heroes, The Settlers II, Goodbye Deponia, The Bard's Tale, Guilty Gear Isuka and Outcast 1.1.

I downloaded all bonus content as well as all game installers (Windows only, German and English only) and did a binary compare with the files on my hard drive.

Result: If you have been keeping up to date during the last months thanks to MaGog then nothing has changed.