Hang on to your Zac Efron — the Disney Channel is ramping up for a fourth cycle of High School Musical. The second edition, which aired last summer, racked up 18.6 million viewers. The third edition hasn't even been released yet, but when it is, it'll first be seen at the multiplex, not your living room. But now that the original cast of the lucrative show is busy with other projects, like sending naked photos of themselves and fighting off gay rumors, don't expect the original cast to return. "At least one approach that's been floated for a High School Musical 4 would simply be to go with a largely new cast and employ a plot that takes place in an early year in high school, opening the possibility for more sequels with new stars" and more forever pre-pubescent leads!