Seth Rogen will voice the character of ‘Rolf’, the piano-playing dog, in a new Muppets movie.

The film, which will see the beloved characters putting on “one last show” in an effort to keep their theater from being sold to an oil tycoon, will see many of today’s most popular comedians bringing the popular Muppets to life. Leslie Mann from Knocked Up and Bill Hader from Superbad are “playing members of “Dr Teeth and the Electric Mayhem, but the writers aren’t saying which characters.

According to Rogen, much of the voice cast will be kept a secret to the audience.

It’ll be a surprise for everyone. The voice actors of the Muppets are done… they’re tired…. It’s time to give them all a new set of lungs. It’ll make the new movie funnier, too – give it that extra something.”

Update: Bah! Looks like this was an April Fool’s Day joke according to a few emails we received and also by a comment made. Hardy har har…