Persona 5 is top priority on my list for 2015. I've been wanting new a new Persona experience, and ATLUS is finally delivering at last after milking the Persona 3 and Persona 4 franchises to death. Coincidentally, I also plan on picking up that P3 and P4 crossover game Persona Q: Shadows of the Labyrinth this fall, but only because it's inspired by the Etrian Odyssey series.
Thief looks really slick. I'd like to pick it up, but it's going to be on my wishlist for a little while longer.
I'm also anxiously waiting on Kingdom Hearts 3, Zelda Wii U, Monster Hunter 4 Ultimate, Monolith Soft's X, that new Harvest Moon title and the new Smash Bros game to drop. Cautiously waiting on Final Fantasy XV. I'm doubtful that XV will be the game to bring the Final Fantasy franchise back to its former glory, but at the same time, I want to believe it will.