In a recent tweet by GOG
I couldn't help but notice the 2 Gears of War stickers on their coke machine. While I don't believe we'll see Gears of War on Tuesday (is it possible?) the strategically placed bag next to the machine could be a bag of rabbit food. I'm not sure if that's a cat or a rabbit on that bag. Epic Games developed the Gears of War series as well as the Jazz Jackrabbit series and already has some games on GOG.
Of course this could all be an elaborate trick by GOG :)
Chances are, those are stickers they got from Microsoft; it might not be indicative of GoW coming to GOG, but it's perhaps indicative of Microsoft coming to GOG.
That's quite a leap, though I would personally like to see Age of Empires series come to GOG (does Microsoft Games or whatever still have the rights to them?)