ALRIGHT BITCHES HERE'S THE SCOOP:
http://youtube.com/watch?v=JQaxfhJlP44
The Werewolf stages are basically "See how many enemies you can kill while getting to the end", instead of "See how fast you can get to the end". You're slower then the normal stages, but you're not really slow. You're just not as fast.
Also, Weresonic has the ability to use really stretchy arms, and to summon light meteors as a sort of final smash.
According to the trailer, this is the beginning cutscene: Robotnik is out to destroy Sonic, but Sonic tries to stop him...but gets caught, and becomes Robotnik's guinea pig. The experimentation goes horribly wrong, and Sonic breaks out of there as a Werehog. I don't know the rest.
It has a new theme song, "Endless Possibilities". It's going away from the "badass" stuff that recent themes had, and is trying to fit Sonic more. There's a little bit of rap, but otherwise it's great.
The graphics are styled now, instead of the realistic shit that previous titles had. Also, there's a scene in the trailer where you jump off a ramp, go in slo-mo, and push a button combination as fast as you can to get a speed boost when you land. And yeah, Sonic's model looks a lot more classic-styled now then "grown" like Sonic 2006.
This might be alright.