So... they'll be jerks? And possibly sleeping around?

Well, I was thinking a reinvisioning of the Turtles story with a grittier feel. Have you read any of the Eastman and Laird Turtles?

Yes, I did. It was actually a lot grittier than the cartoon, if I remember right. Hmm... Kasey Jones would actually fit perfectly Ultimized.

but but... ultimate spidey's so FUN!

It is fun, and yet it's also grittier.

Ultimate TMNT!