Played some demo.
It certainly looked better in person than on video. Good use of color, in action looked smooth and effects looked fantastic. While raw graphical prowess isn't better than SFV, GGXrd or upcoming Tekken 7, style makes up a lot. This might be good thing, PlayStation 4 doesn't have to work that much to push graphics.
Musics sounded good. I've only heard these on videos while usually someone is talking over them. The themes I've heard already trumps over XIII soundtrack in my opinion. So far my favorite is K' team's theme. Might've been television speakers, but I couldn't hear character voices that well.
What about the gameplay? I'm liking the concepts and they certainly require more excecution than you think, but not XIII levels fortunately, I think. I would've liked, if SNK included some combo trials, so I can get some hints what character could do.
Game felt responsive and smoother than XIII. I could actually do the whole tutorial with arcade stick, but that could be because I've played DOA5LR with it, so I'm better with it. XIII was first game I tried stick with

Jump in attacks felt easier to do compared previous entries, so maybe timings aren't so strict?
Some UI things could be better though. Getting to command list was kinda hassle. It usually has been Select button, but PS4 has Share button instead of that

Now I have to press start, select command list, then slect character I want to look at and then go back. Touch pad reset was nice though. I'd like if I could select three characters for training mode and switch between them, so I don't have to spend so much time on menus, but that's exclusive to 2003 and XI sadly.
Overall, game felt promising. I can see me spending time learning stuff and maybe even playing against real people. I hope there's lots of unlockables and that netcode is good. Promised online features sound good on paper, so I hope SNK can deliver.