The problem with the way the extra footage was put together?
It was soooo mixed up, it could very well be misleading.
As I said before, there were clips from the movie that was clearly the movie, and then they'd drop in a clip of an animation test that was from all the pre-work. Then another movie clip, sometimes a fast view of something and it was gone, sometimes something with a bit of dialogue. And sometimes it was the finished look, sometimes the blocked in not fully rendered stuff.
About the only section I remember being sure about what was going on was Mikey in the party suit getting whacked by a bunch of kids. Clearly, there must have been a reason they enjoyed thrashing him rather than having fun with him or enjoying his company. And clearly, this disturbed Mikey a lot at the end when he was rolling around in agony on the floor as the kids left the room. And when we get to see the movie, I'm sure it will make sense.
I get the impression--which could be wrong based on limited info we have--from what we heard in that one snippet story release before the Con and what we saw, something happens that divides the TMNT, and they go their own ways. And things turn ugly, things are going very wrong. And they have to be brought back together to face the new evil monsters that have appeared. That's my guess.
So you've got clips of Raph in this heavy metal-like biker gear.
Mikey's doing parties? But I think that suit/head of his might get used later in the movie, too? Because there was also a clip of Mikey inside a helmet of some kind, and he's all freaked out about where he's going and what he's doing. He's communicating with someone else, probably Don or Leo about the situation.
That fast glimpse of what had to be Karai....
So does Raph kill Leo?
Naaah.

But a lot of people get the impression Raph's going to win that fight.....
