There isn't one yet. For me.

I think it will be final fantasy 15. For me.

For you?

Xbox One- Halo 2 Anniversary/Halo 5 (not my cup of tea, but it's Microsoft's biggest selling point)

PS4- Final Fantasy XV

Wii U- X

Kingdom Hearts Triple. For me, at least.Uncharted 4, Driveclub, Assassin's Creed, Batman, etc....I'll just get those just by going through the motions of buying games for the system I own.

But if I didn't have a PS4 already, and KH3 came out tomorrow, well.....I'd have a PS4 tomorrow

Final Fantasy XV or Uncharted 4 depending on which releases first (yes, I still believe that there might be a chance we'll see FFXV before the next Uncharted. A man can dream, right? :D)

I dunno, I'm most looking forward to Destiny and MGSV, but they're both available on last-gen hardware. Right now I don't think there is a "killer app" on the horizon for either PS4 or X1. I'm sure E3 will tell us more.

Whichever comes first of either the divion and uncharted 4.

For me I think it would be Uncharted 4, SW Battlefront 3, The Division, Final Fantasy XV and The Order: 1886.

 Destiny, Watch Dogs and MGSV too if they weren't coming to last gen.

For me Destiny if it will be like I hope. As exclusives Halo on Xbox One and Uncharted on PS4. Could change if a game like Sunset Overdrive or The Order will blow me away which I don't believe yet.

titan fall so that ship has sailed for me already....unless you meant multi plat......then I'd say..............watch dogs...

Hmm.....

Ok I won't count games releasing on last gen as well so the first absolute must buy next gen only game for me will be.......probably Witcher 3 or Quantum Break (depending on which comes out first)