I'm a little skeptical on how well SFIV will play. Judging from the first link, it looks like the animations for attacks take too long, especially Ryu's sweep. The problem that happens a lot with 3D graphics is that they tend to add too much animation for things which just makes them end up looking unnatural. In this case, it might cause some response delay during the gameplay, but we'll see. That new Abel guy looks kinda cool, but that new chick looks like a dude.