User blog comment:Mobo85/Jim Hill on the Future of Phineas and Ferb/@comment-3347644-20110924230103/@comment-3212462-20110924235548

"'The series will continue, and more spin-off projects are already in development, such as a feature film that might have the "Phineas and Ferb" characters animated and the rest of the performers live-action,' Povenmire says."

Just as I suspected. Hopefully, they'll stick to that. But even if they don't, I'm sure we'd all certainly go see it anyway. ;)