I love the fact you can switch between OST's.

Gonna have to buy again. When I finish FF Type Zero HD, I will be able to play this very soon after.

Same =D

Also this - Ability to Switch Between Original and Remastered Soundtrack - Play Final Fantasy X with the beautifully remastered soundtrack or, new to the PlayStation 4 system version, switch back to the original classic tracks.

SO MUCH YES!!!

It'd be surprised if it doesn't share since the PS3 and Vita share it and there will be cross-save functionality.

Well, not surprising but not going to get it, FFX and X-2 were good but I got the PS3 version and didn't finish them.

Already have it for Vita, but those PS4 textures are crispy.

The key features should include no loading times, if the PS4 port won't have them that is, but it would be hilarious if it did xD

Question: Will it be bigger than PS Vita and PS3 version (sales of course)?

PS4 version is a little bit better but more expensive. Vita version is cheaper.
But if you want to play the game only on the Vita, you should buy the Vita version.

It's kind of sad the biggest reasons to get a PS4 are old games such as this. It's also retarded Square Enix didn't do the soundtrack thing properly with the PS3 version already, because I would have got that version otherwise. Now it's doubtful if I'm ever getting this because there's still not enough reasons to get a PS4 and too many reasons not to get one.