Take this with a grain of salt:
Joblo is reporting that they have found out the Robot Cast of Transformers 4. Potential Spoilers Below!!!
"So, today we have a bit of a scoop explosion, which comes from a reliable source who relayed a hefty amount of info on some big upcoming projects, gleaned from a recent marketing event. One of those projects is TRANSFORMERS 4, which entails some information that, if true, will likely alter the perception of many who are fatigued with the franchise.
That's right, folks, our source has confirmed that TRANSFORMERS 4 will feature none other than the famed Dinobots, including fan favorite Grimlock. No word on whether he'll retain his neanderthal voice, but one can only hope he does as that's a true staple of the character. One of the villains of the film will be a character named Lockdown, who has a ship full of decommissioned Transformers, including the dinobots, which are somehow brought back to life by a captured Optimus Prime. Prime is joined by returning autobot Bumblebee and at one point both characters (and potentially others) will "ride" the Dinobots into battle in Hong Kong (which fits well within the announcement that the film would film partially in China), with Prime on Grimlock and Bumblebee on a Pterandon, presumably Swoop.
Additionally, the autobot Hound will make his debut, as well as a former "Samurai" Decepticon that wants to regain his honor and become an Autobot. And what about Megatron, who is presumed dead after the last film? Well, fans of TRANSFORMERS: THE MOVIE will be happy to know that not only will the dinobots be making their debut, but also Galvatron, who is basically Megatron "reborn" (and originally voiced by the first Spock, Leonard Nimoy)."
What do you think? Rumor or truth?