You need not worry, Kevin is always more than happy to talk Turtles. And he's also more than happy to sign anything you want signed and he seems to be constantly drawing things, so that's no problem either. He's not officially involved with the Turtles anymore, but he has not cast them out of his life.
You'll be able to find him at the Heavy Metal booth. And more than likely they'll be selling his TMNT Artobiography (which if you don't already, is a MUST have).
While most of them don't post here, the group I'll be attending with are all past and present members of
TMNT-L. The size of our group varies every year (being rather small last year to being the biggest ever this year) and the people who work at the Heavy Metal booth recognize us as "Kevin's Posse."
I'm assuming then that you'll be at the con. Check your PMs... I'll feed you some more info.