According to sources such as Windows Central, GameSpot and The Verge, Microsoft are nearing the introduction of a "Game Mode" to Windows 10. The Game Mode would adjust how resources are allocated within the PC as well as hibernate or shut down most background programs, freeing up more computational power for the use of games. Essentially, it would make a Windows 10 machine function more like a console than a traditional PC.
Details are still understandably very slim, as most of the info is based on Windows Central's sources and a leak from an upcoming Windows 10 build (14997). The two main questions are probably how major of a performance boost this Game Mode would bring, and what kind of games would the mode support? Would Microsoft be hawkish enough to only allow the feature for games in the Xbox ecosystem, or could services like Origin and Steam also gain benefits from this?
In any case, I guess even a slight performance boost to only a few games is not a bad thing by any means. If this means that I can finally reach a solid 60 fps in Forza Horizon 3, I'll be pretty content.
EDIT: Edited the title to reflect the confirmation of the rumors.