The latest rumor for a new Windows update comes from Twitter user WalkingCat. He
reports the addition of a dll called "gamemode" in the latest update for Windows 10 . He also tweeted the following "looks like Windows will adjust its resource allocation logic (for CPU/[graphics] etc.)"
WindowsCentral also backs up WalkingCat by stating that the gamemode will run games similarly to the Xbox One. There is no confirmed date for the update, but it is expected that it will roll with the Creators Update, which is due out this spring.
What games will it include is yet to be seen. I may just be the ones purchased from the Windows Store, but it could more wide spread than that. Hopefully it will include a wide array of games.