Will the cast change for Godzilla 2?

I honestly think that Brian Cranston won't be on this one...

I hope not

@JOAML02: well, duh, he's head.

As for the OP's question: I expect some of the same actors to stay, others to go and be replaced with new ones (Laurence Fishburne, please!).

Ken Watanabe should stay as main, Ford now secondary, 

New actors I want:

I dunno

Im sure we will see some new faces in the sequel. Sequels are, in general made, too expand a movies universe and thereby also its characters. Which actors and which characters is anyones guess though.

I agree with Godzilla316, Ken Watanabe should be in the next Godzilla film. The rest of the characters could be changed, as far as I'm concerned.