Warning: Fanboy Idea

How about a "factional war" between the Decepticons on
Earth with the autobots and humans caught in the middle.

With the Fallen dead, Shockwave leads a new Decepticon faction (Triple Changers?) to destroy Megatron and claim leadership. Megatron and Starscream gather a new army (Combaticons?) and an all out war begins across the planet. The Autobots have no choice but to call in reinforcements which include Ultra Magnus, Wheeljack and of course the greatest Autobot warrior of all time...Omega Supreme.

Fanboy Idea Over