I kinda really want a Vita now for Remote Play on the PS4.
Yeah, I hear it works really well, which is rather surprising considering the remote play from Vita to PS3 isn't too great.
Don't you have to own the game on both platforms for it to work, though?
If so, that's really not all that cool. That's pretty expensive for a small convenience.
Nah, you're probably thinking of Cross-play, which is for games that are on both platforms and let you transfer your save between them.
Remote play is to play PS4-native games streamed on your Vita, through wifi or even 3G. The issue comes with the fact that the Vita doesn't have R2, L2, R3 and L3 buttons on it, so you have to use the back touchpad.