Ten years after the "High School Musical" franchise released its first movie with a big bang, a fourth film is finally on the way and Disney fans can't wait to get a look at the new cast members and the possible return of some alums.

Unfortunately, not all of the alumni Wildcats will be seen in the upcoming installment. According to HNGN, fans may not see Zac Efron's Troy Bolton and Vanessa Hudgens' Gabriella Montez since they haven't confirmed if they will make an appearance. There are also some who believe Efron's cameo may have been blocked by his alleged new project, "Fifty Shades Freed."

Though Efron has not commented on the issue, he has previously posted a photo of him with HSM co-stars Ashley Tisdale, Corbin Bleu, and his ex girlfriend Hudgens.

The return of the other cast members has not yet been announced but fans can expect a whole bunch of new faces and new stories that will continue the legacy of the East High Wildcats.

Meanwhile, casting is on the way for five new leads who will take the place of the former East High starlets. According to E! News, one of the characters will be Campbell. What's interesting about this upgraded version of Efron's Troy is he is actually Sharpay (Tisdale) and Ryan's (Lucas Grabeel) cousin.

Many are expecting that the actor who will take on Campbell's role will at least hit the level that Efron's Troy did. After all, Campbell is described as "Troy 2.0."

Production is also on the lookout for someone to play Erin, the only girl in the all-boys soccer team. She will fall in love with a bad boy so viewers can safely assume that she will face a battle with her heart.

Other characters who will star in the fourth "High School Musical" movie are Derek, who will be Erin's love interest; Nathalie, Erin's best friend and a cheerleader; and Tamara, the former queen bee who is starting to look like Tisdale's Sharpay who wants all the attention.

The release date of "High School Musical 4" has yet to be announced by Disney.