They can change drastically and completely especially with so little shown. Just like Chunlis v trigger which turned her into Morrigan in showings to just a generic multi hitting install in the final game.
You are really reaching. The difference between that and the situation at hand is that Chun-Li's v trigger change was quite early in development, SFV didn't even have a release window at the time of the change. Right now the game has an actual date, not much is going to change skillset wise for anybody. The more pressing issue is the hud and the visuals cause last time we saw the game both of those didn't look good.