Final Fantasy XV:
When I saw the first trailer way back when (2006?) it blew my mind (OMG 13(+) weapons at the same time). Every trailer that we got every year or so pumped me up even if it didn't have any gameplay the look and feel was awesome and it still is today. When I first saw an actual gameplay trailer (I think 2011 for PS3), It was heavily based on the Kingdom Hearts franchise so that would be an instant sell for me. The last trailer changed the orignal "Final Fantasy versus XIII" to "Final Fantasy XV" for PS4. That was actually the only game back then that actually looked like it was next gen (now current gen

). The interface was much simpler and different than the Kingdom Hearts franchise but it still felt awesome even though it isn't perfect (not necessary for me). The Japanese voicecast sounds awesome (hoping for optional japanese audio for EU).
Basically I've waited patiently for many years now and when it finally comes out, that will be the day I buy a PS4.
Also the music is done by Yoko Shimomura who composed the music for the Kingdom Hearts franchise so I expect a lot of Latin Choir induced musical orgasms (every trailer music i've heard does that already

).
Also... awesome grinning behemoths, Leviathan, some oversized impractical swords and really nice clothes.
Hopefully we'll still have summons
Kingdom Hearts 2.5 HD reMIX:
I never had a PSP so i'm glad I'll finally be able to really play Birth By sleep. Also proud mode and final mixes so yay for that
Kingdom Hearts III:
This one is kinda obvious since I played KH, KHreCOM, KHII, KH: 358/2 Days, and KHreCODED (KH:BBS i've watched on youtube and soon i'll get to play it with KH 2.5 HD reMIX; KH3D I've also watched on youtube cuz i don't have a 3DS).
The only thing I'm a little worried about is wether or not I'll like the new graphical style they use. Every other game had the same PS style graphics (even KH COM on Gameboy Advance had PS2 style cutscenes). They could have kept the same PS2 style graphics but sort of upgraded them (no more blank eye stares) and I'd still be very happy

.
Those 3 games are basically the only ones I'm REALLY excited for. Hell I'll buy them even if everyone would hate them and critics would bash it (ya know cuz it's Final Fantasy and it is fun and cool to really hate it and beat the dead horse to pulp (or in this case Odin from FF13

))