After the big debut of "Camp Rock" during the weekend, Disney Channel is wasting no time working on a sequel to the Jonas Brothers movie musical.

The network hopes to go into production on a sequel in late spring or summer 2009, pending a script that's in development as well as the cast members' busy schedules.

All of the principal cast -- including Joe, Kevin and Nick Jonas as well as Demi Lovato -- are expected to return. The Jonases and Lovato, who are touring together this summer, also are working on their respective Disney Channel series, "J.O.N.A.S." and "Welcome to Mollywood."

"Camp" debuted to 8.9 million total viewers Friday night, the cable network's second-most-watched original movie ever behind "High School Musical 2" (17.2 million) last year. A second airing Saturday night on ABC pulled in 3.6 million viewers, while a third airing Sunday on ABC Family averaged 3.7 million viewers, according to Nielsen.

Meanwhile, the movie's premiere in Canada became Family Channel's second-most-watched movie ever, behind "HSM 2," (848,000 total viewers vs. 1 million).

The "Camp Rock" soundtrack is expected to debut tomorrow in the top 5 of The Billboard 200.