A question about the cast.

[mcmaxslb]

Hello all. I just joined and would like to ask this question. ABC 
network showing SS and Daniel Radcliffe, Emma Watson & Rupert Grint 
are hosting. Also they will have clips of PoA. Now on the HP Lexicon 
I found a National Geographic for Kids article that states that the 
Trio, and I guess all the other child actors, are only signed for the 
first three films and TPTB are waiting to see if they are too old for 
#4.

  Now this is something that I have always thought about in the fact 
that the books happen one year the other(not the writing the 
timeline)  but the movies take more that a year to make that the 
current cast would out grow their roles, something that is going to 
be obvious this Sunday. The question is has anyone heard if the 
current crew will do GoF or have TPTB begun to recast?