"High School Musical 4" really is happening! There are a lot of things fans need to know about the sequel to the hit Disney musical. Earlier this year, Disney Channel announced that the hit musical will be back once again. However, it will feature a brand new cast.

MTV reported that the Disney musical will feature new East High Wildcats. Not only that, they will also feature their rival the West High Knights. The site speculates that there will be some sort of West Side Story-type love saga that might happen.

This might be a sad day for all Wildcats because Vanessa Hudgens is probably not returning for the new musical installment. Hudgens is rumored to be replaced by Taylor Swift.

This is likely because of the rumors spreading that Vanessa Hudgen's current boyfriend Austin Butler is unhappy with the Disney musical sequel. According to Enstarz, Butler is uncomfortable with the Efron and Hudgen's reunion.

The rumored return arise after Zac Efron and Vanessa Hudgens posted photos of the original cast members of the hit Disney musical on their social media accounts. There are also speculations that Efron and Hudgens will only return for a cameo.

Aside from that, Travelers Today reported rumors spreading that the original cast members will not take part in the "High School Musical 4." The site reported that the executives of the show are already making casting calls for the new movie.

There are also rumors spreading that Zac Efron and Vanessa Hudgens has already started shooting the new addition to the hit Disney musical. Despite this, Disney is yet to confirm or deny this rumors.

"Teen Beach" director Jeffrey Hornaday and "Hannah Montana: The Movie" writer Dan Berendsen were tapped to make "High School Musical 4." This will also be the return of Peter Barsocchini, the writer of all the "High School Musical" movies.

"High School Musical" stars include Zac Efron, Vanessa Hudgens, Ashley Tisdale, Corbin Blue and Lucas Grabeel. It is rumored to return in 2017.