Why would they need new kids? In the books, they get old a year older - they are going through school afterall. You couldn't have Harry celebrating his 15th/16th/17th birthday and have him (and his friends) still look like he was 12
Penny, did you hear somewhere that they would be using new kids?

I guess if they replaced the current actors it would be because the movies come out less frequently than once a year, so the actors are aging faster than the characters. But still, if Sarah Michelle Gellar and actresses like her can play teens when they are in their 20's, I see no reason why these kids cannot continue to play their roles. Thats what makeup is for!

