HIGH SCHOOL MUSICAL is set for return for a fourth term. A new movie will hit TV screens in 2010, but it won't feature stars Zac Efron and Vanessa Hudgens.   A Disney studio statement reads High School Musical 4 will feature a love triangle "set against the cross-town rivalry between the East High Wildcats and West High Knights."   Peter Barsocchini, who wrote High School Musical 1, 2 and 3, is back in as screenwriter, while Bill Borden and Barry Rosenbush will once again executive produce the project.

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