High School Musical 4

At the beginning of this month High School Musical 4 was announced! I was sooooo excited. I went to the Internet to get the facts and was a little dissappointed. They are going to have an all new cast! What was with the Freshman in HSM3 and saying that Sharpay was going to come back? Why did they film a scene with the new main three at the beginning of the next year? I was mad but a got over it really fast. I'm really glad that they are going to keep on with the series and keep all us fans happy. I can't wait until summer 2010!