Here are some big name upcoming games for 2015:
The Witcher 3
Batman: Arkham Knight
Dead Island 2
Metal Gear Solid V: The Phantom Pain
Halo 5: Guardians
Star Wars Battlefront
Just Cause 3
Quantum Break
Rise of the Tomb Raider
Tom Clancy's The Division
King's Quest
Uncharted 4
No Man's Sky
Any others I'm forgetting?
I'm looking forward to seeing what Quantum Break is all about. The concept seemed really intriguing when they first debuted it at E3 in 2013, so it'll be interesting to see what that's all about. The Division I remember looking pretty fun at E3 last year. King's Quest I'm SUPER pumped about because I used to play the PC games as a kid and it's been years and years since they last put out a game.
In terms of franchise games, Battlefront is a definite buy for me, as is Tomb Raider, as I really enjoyed the reboot game in 2013. I'm sure I'll pick up Halo 5 at some point as well. Uncharted 4 would be one I'd be interested in if I had a playstation.