Autobots:
Peter Cullen should play again Orion Pax/Optimus Prime
Elijah Wood as Bumblebee
Jeffrey Combs as Ratchet
Phil LaMarr from Transformers Animated reprising his role as Jazz
Laura Bailey as Arcee
Diedrich Bader as Ironhide
James Horan as Wheeljack
Michael Ironside as Ultra Magnus
Bill Fagerbakke as Warpath
Kevin Michael Richardson as Brawn
Decepticons:
Frank Welker as Megatron
Tom Kenny as Starscream/Skywarp
Rick D. Wasserman as Demolisher
Issac C Singletons Jr. as Soundwave
Steve Blum as Shockwave/Barricade
Wally Wingert as Thundercracker
Darran Norris as Knock Out