75% off X Rebirth
75% off X Rebirth: Home of Light Complete Edition
75% off X Rebirth: Home of Light Complete Edition Upgrade
50% off X: Gold
50% off X2: The Threat
50% off X3: Reunion
50% off X3: Terran War Pack

Are these some of the upcoming Winter Sale deals leaking back in time or what? :P

Nah, they're also discounted on Steam. :p

Not a great price on the old X games, but maybe that high price is an indication they are in a bundle with a better discount.

That's what I thought too, but they aren't... yet?

We know there are sometimes discrepancies in the bundle prices and sale prices, so it's likely the single game prices are added seperate from the bundles. The bundle part might have the correct start and stop dates and times while this single games were entered incorrectly. The discount scheme is similar to the current discounts ending on Steam today. But on Steam there is also a bundle package at 75% off for the old games, 80% off a bundle including X Rebirth and expansions.

https://www.gog.com/news/x_rebirth_gets_big_update_is_75_off_for_48h

So... no bigger discount bundle during the Winter Sale?

9 movies are on sale, 50~67% off:
https://www.gog.com/movies?price=discounted

Pretty sure they're just part of the Winter Sale :)

Usually sales near big sales have similar discounts or they aren't discounted at all during the big sale, otherwise people might feel upset on buying recently at a higher price.

90% off We are the Dwarves
25% off Night in the Woods: Weird Autumn Edition
20% off Crashlands
20% off Crashlands Soundtrack

Slime Rancher added to Weekly Sale, 33% off.
It was not discounted when the sale started.

Also INSIDE, LIMBO and Mini Metro added to the Weekly sale today.
GoG Sales 2018

3 new games have added to the Weekly Sale.
Sudden Strike series is also added (25~50% off).
https://www.gog.com/promo/20180101_weekly_sale_war_games