The stills so far definitely look great. Just judging from all the info we have so far, it has the potential to be something truly special.
And this might sound like a silly request, but I hope they don't overdo it with the special effects and throw in tons of special moves. I really like how the first animated Movie did it. Whenever something like a Hadouken was used, it wasn't used more than once in an entire fight. Ryu used it once against Sagat, then again when he did the double Hadouken with Ken against Bison. I don't want to see him throw one multiple times, because he either missed, or it got blocked. That's the only thing I didn't like about the Legacy Short.
Special Moves need to actually be "Special". They should only be used when the character is sure to hit, and when it hits, the opponent should be pretty much down for the count. No silly blocks. And when a Hadouken misses, the person should take a while to regain his energy. Hadoukens and other projectile moves should be draining, and be a double edged sword. When you hit, it's almost an instant win, if you don't, you are going to be tired, and can't just whip out another right away. Oh, and only some chosen characters should be able to do it. I wouldn't want Guile for example to be able to throw his Sonic Boom. Because stuff like that makes me always wonder why the military doesn't just train all their soldiers to be able to throw energy attacks.