So obviously Tidus is turning into Sin, which is why he's acting different, and why he's injured. He's obviously trying to fight it because he's a good guy, but his new Jecht-like hairstyle can imply that he's going the way of his pop. Also, a shoopuf coming back, as well as fayth coming back, says that things that should be permanently gone aren't anymore. Hence, Sin is returning, and now Tidus has to become sin.

I like the new designs, dunno why you're bitching. It looks good. Times have changed for them.

The most interesting thing to me is that FFX-2 was a "bad dream" and Rikku and Paine aren't mentioned? xD Hmm, I wonder how that will play out!