Honestly, nothing yet.
Mirrors Edge could be cool, but I'm not exactly hyped.
And there aren't many others I have heard about that excite me.
2015 hit me as a good year for games, with Witcher 3, Fallout 4, Just Cause 3 and other titles I was looking forward to.
But I heard of most of them during 2015, rather than in 2014. So maybe it is too early to get excited for 2016.