Valid request.
Super Smash Bros 4. - I love the Smash series, and I'm really excited to see how the new characters work with the old lineup.
Watch Dogs. - Looks like it has huge potential for innovative gameplay, and a decent storyline, with a lot of great possibilities for deep topics.
And most of all, Transistor. (I'm assuming it's still releasing this year, I haven't heard otherwise.) What can I say? Bastion was my GotY when it came out, a pitch-perfect game, and it looks to me like they've captured most of that lightning in the bottle of Transistor. It's my one must-have game for the upcoming year, and I might not even wait for it to go on sale, which is unheard of for me these days.
Also, I forgot it when I did my previous list, but Hearthstone. I've seen a lot of gameplay of it, and it just looks plain old fun, while at the same time having enough challenge and variety in it to keep me interested... especially if they add a few more cards to each class.