Doom and gloom brigade in 3.... 2....
The basic gameplay has already been shown, and apparently works pretty well. I don't see any huge changes besides maybe an Easy Operation mode. Which is irrelevant, since if you need it you're not going to outplay a better player.
I'd very much welcome a GGXrd style story mode and an actual tutorial besides "here's some 20 hit linked combos, enjoy". That would go a long way towards enticing players.
And hopefully a smaller cast. Seriously. I've been playing Street Fighter semi-casually for over 20 years. While I know the basics and most of the stuff of my favourite characters, I can't keep track of every normal, special, super and ultra for 40+ characters. I imagine as a new player being thrown in, it's insurmountable. Don't forget that many of the best fighting games ever made have 10-20 characters. If that means trimming the fat, by all means do. Just like when SF3 turned up with a slim cast, some were turned off and stayed with Alpha to keep playing their favourites. Well, we have USF4 for that. (and yes, SF3 was a flop but look where it lead to eventually)