rumble the little dude, galvatron (since megatron had his head ripped off there has to be a bad guy) blaster and astrotrain. Oh and the airial bots all of them since in the dark of the moon there seemed to be endless decepticons( and the autobots still won shorthanded) give them some more help LIKE THEY NEED IT!
Bay should bring back Shockwave. The way Optimus killed him in DOTM doesn't do him justice.
If they bring Ironhide or Megatron back to life, the story will be loose. No Autobot death will have an impact on the audience again.
(Shockwave's death is not seen onscreen. Optimus just throws him aside.)
Dinobots seem like a loose end. Transformers pick the first mechanical device they see that suits their size (and taste). Where would they scan a mecha-dinosaur? Also, it isn't exactly a camouflage.
