We saw the Nemesis on Mars in the last movie, now we're seeing what appears to be the Ark on the moon. This gave me an idea. What if this is a reference to the first episode of G1. Maybe after Megatron discovered the AllSpark was on Earth, the signal he sent out called for the Decepticons. Then the Autobots intercepted it and left Cybertron first which the Decepticons quickly gave chase. Then like in the cartoon, the Nemesis caught up to the Ark and the 'Cons boarded and had a battle with the Autobots on the Ark. Since the Nemesis was abandoned, it crash landed on Mars which they were passing by. The battle on the Ark raged for quite some time until it finally went down and crashed on the moon. Most of everyone was killed except for maybe the new characters from ROTF? (maybe, maybe not?) I don't know, it's just what I thought.