Who will be the next Zac Efron; the next Vanessa Hudgens; the next... hat guy? Soon, we'll be finding out, because Disney Channel has reportedly made official their plans to produce a fourth entry in their High School Musical franchise. With the original actors now too old, and Disney Channel's fresh-face birthing tubes currently clogged with hair, it's said the cable network will be holding open casting calls to find their new stars. Let all the teenagers know: it's their chance. To become Hat Guy II.