Actors John Goodman (Roseanne, Flintstones, Monsters Inc.) and Ken Watanabe (Godzilla, Inception) have joined the cast of Transformers 4 as voice actors. They will play Hound and Drift respectively.
Also we have some returning voice actors which include Mark Ryan (Lockdown), Frank Welker (Galvatron), John DiMaggio (Crosshairs), Robert Foxworth (Ratchet) and Reno Wilson (Brains). This announcement also confirms that Brains will indeed be returning. But what about Wheelie?