Even before High School Musical 3 hits movie theaters in the fall, Disney Channel is starting work on High School Musical 4, according to The Hollywood Reporter.

"We are writing 'High School Musical 4,' " Disney Channel Worldwide president Rich Ross confirmed Tuesday after a presentation at a midtown Manhattan recording studio. It's likely to be a TV movie unlike High School Musical 3, though that could change.

The news comes as the stars of the two smash hit TV movies are preparing for production on the third installment of the series, which will begin filming in two weeks in Utah. There's no word on whether the cast and behind-the-scenes talent will gather again for High School Musical 4, though some characters introduced in the third go-round likely will star in the fourth.

"Are we going to have all the cast back? Probably not," Ross said. "Will we have some of them? I hope so."

Brian B.