First off this is just a theory. Theories are just educated guesses not fact. This is my theory for how ROTF will go down. After the first film Starscream flies back to Cybertron and gathers forces for war with the Autobots on Earth. Meanwhile the Autobot forces hear Primes broadcast to the Autobots. They travel to earth from either behind the moon or from moon base 1. Starscream declares himself leader of the Decepticons. Soundwave and SC have an awesome battle on Cybertron. Soundwave, being a Megatron loyalist, travels to Earth with his group of Cons to try to revive his fallen leader. After Megatron comes back Megatron and his followers create Devestator combat the Autobots. The movie ends after the Autobots get their butts kicked. Not exactly setting up for a sequel but not the "good guys always win" ending either. Feedback welcome.