Re: Transformers 4 is going to be AWESOME.
I kind off wonder if they plan on pairing Hound up with one of the new human characters, maybe the teenage girl, as a variation of the Sam/Bumblebee relationship from the first three films. Probably moving Bumblebee out the human liaison role, though he'll inevitably still have a major role.
I can't say I'm surprised about Galvatron taking the reigns of the Decepticons. I think they should make him a seperate character from Megatron and not follow the usual upgrade route. I actually wouldn't mind see Frank Welker voice the character using his Prime Megatron voice, since Hugo Weaving isn't coming back either way.