Writers getting ready for High School Musical 4!

Now that HSM 3 will graduate in October, the writers are starting the script for High School Musical: The New Generation, without the first cast?

TV bosses said writing was under way, but it's not clear if HSM's biggest stars Zac Efron, Ashley Tisdale and Vanessa Hudgens will be back.

President of the Disney Channel Rich Ross said: "Are we going to have all the cast back? Probably not... Will we have some of them? I hope so."

He added that it's "likely" HSM 4 will be a TV movie and NOT a cinema release.

Ashley Tisdale burst into tears while filming her final scenes for High School Musical 3: Senior Year - because she is devastated her part in the franchise is over.
The actress has been involved in all three of the hit teen movies so far, but won't be playing Sharpay Evans for a fourth time.
And she insists she wasn't the only one to shed a tear on the last day - her castmates Zac Efron, Vanessa Hudgens and Corbin Bleu all got emotional too.
She says, "We went into the last day thinking, 'It'll all be fine 'cause we're all really good friends and we're so close.

"It wasn't even the last scene - we couldn't even get through it. We were crying and just so emotional over the whole thing.

"We're so attached to each other. We've had such fun doing these movies. It's definitely something that's tough to leave and say goodbye to."

Tisdale also confirms she is not the only one who will miss out on a further Disney follow-up.
She adds, "I heard they're going to do a High School Musical 4, but we have nothing to do with it. I think we're all doing other projects and moving on."