It’s what all the teeny boppers have been waiting for….. it’s official!  Disney Channel execs  just confirmed that they already starting work on High School Musical 4!So when do you think HSM 3 will come out ? Soon?  You know it’s still being filmed!What about the cast…. right?!?!?”Are we going to have all the cast back? Probably not,” Ross said. “Will we have some of them? I hope so.“