So, apparently, Dwayne Johnson - The Rock - is going to be voicing Cliffjumper in Transformers: Prime. This is unexpected, ridiculous, and pretty awesome.
Also, Amazon leaked some pages from the TF: Prime preview comic the other day, revealing a few character designs, namely Starscream and Bulkhead. We see a lot of Starscream, who is like a really creepy version of his Animated incarnation (no nose! so creepy!) and appears to be in charge of a bunch of those Decepticon car drones. Bulkhead we see less clearly, but he seems to stick pretty close to the Animated design, sans back-mounted kibble "wings." Oh, and then there's Breakdown, who's this massive guy, not at all like his War for Cybertron incarnation* (or any other, for that matter) who is a bit reminiscent of the unused Transtech character Immorticon. He also looks like he could be Bulkhead's blue brother, just more ripped and less fat.
*Why does this matter? Because, according to Hasbro, the War for Cybertron/Exodus continuity (such as it is; the two don't mesh that well) is the same continuity as Transformers: Prime. This is all despite the characters looking virtually nothing like each other across the two stories. Starscream in particular (and the aforementioned Breakdown) is a pretty extreme example, but even Optimus, Bumblebee and Megatron look pretty danged different. WFC has a distinct G1 flavor to it; none of the characters in it that originate from the G1 continuities had a major design overhaul, they're all recognizable (save for maybe Barricade, who takes some cues from the movie version). This is in contrast to TF: Prime, where the character designs seem very much to be a mix of the Animated and Movie/RotF aesthetics.