LOL, yeah. Somehow he got his voice back (which was never explained) and then he inexplicably lost it in the next movie, I guess because Bay realized that the only way to keep a character likeable in his films is to not give them dialogue.
It's weird. I have no interest in this movie. I don't know anyone who is interested in this movie or even remotely cares if they EVER see the Transformers on the big screen again. And I know that when the trailer inevitably hits, it will be full of Gigertron making the same dumb threats, Optimus speaking in stupid platitudes and giant piles of junk falling from the sky and crushing people.
And yet I know that I'll go see it. I know a lot of people will. And I know it will make a ton of money. What the bad place is wrong with all of us?