Just go and google Transformers: The Prime Wars. The next chapter, since Combiner Wars is basically done, is Titans Return, which will bring back the Headmasters. And the ending for Devastation shows blueprints for Optimus Maximus from Combiner Wars.

It’s no rumor. Hasbro announced it as The Prime Wars Saga. A huge Transformers story spanning across comics, toys, and games for the next few years. The game, Transformers: Devastation is a prequel to Combiner Wars.