I think my main concerns at this point are simply:

-TF's not getting a significant boost in screen time and characterization.
- Michael Bay getting Soundwave all wrong as a character
- Lackluster line-up of new Autobots and Decepticons

 

My fears:

1) Having another, or in fact more than one, favorite Autobot characters being killed off.
2) Decepticons have very little lines, and if they speak at all, it's all "Cybertronian."
3) The Fallen isn't who I thought he was gonna be.
4) The Autobots would find a way to defeat Devastator and he gets killed off, which is something I'd rather see in TF-3.
5) That the whole Optimus Prime-Jetfire combining and Pretenders speal is going to pull off extremely bad.

 

That there will be far too many Characters (Autobot/Decepticon and Human alike) to manage and fit into the movie's story, no matter the length of the film, thus becoming another X-Men: Last Stand/Spider-Man 3-Like sequel.

 

my fear is that it will be like the first one...

 

1.Soundwave has to be right.
2.That Alice Pretender.It might screw up the movie.
3.Characters must have good roles,not like Bonecrusher.
4.If Bonecrusher's dead,they better find a proper name to replace one of the constructicons.

 

That there won't be any supergiant like Metroplex.