Looks like Hugo Weaving’s comments were the last straw — Michael Bay has publicly stated on his forums that Megatron shall return in Transformers 2, although he does play down his role — suggesting its more of a cameo within a flashback.
“Okay cat is out of the bag. Megatron is back —- but you will only get to see him from the long lost past. We go way back in time as this movie explains the mythology of the Primes. He is not a tank like everyone suggests, but an alien vehicle. But sadly he does not has much screen time.”
Well it only took toys, images, Orci’s confirmation, Weaving’s confirmation and all the rumors for Bay to make a turnaround on his previous statement that Megatron would not be returning. Sadly, Bay’s new explanation falls into that pool of potential ‘misinformation’, otherwise known as lies. We’ve already seen Megatron’s bio from the back of the leader class toy packaging. Megatron rises and leads an army, et al. Weaving also suggested that Megatron might be resurrected using cube shards.
Rebuilt with parts cannibalized from other Decepticons, Megatron rises once again to lead his army. Though the AllSpark destroyed him once, he can now feel its power coursing through his circuitry. It calls him to seize his rightful place as ruler over the puny planet on which he was imprisoned and destroyed, and from which he will launch his conquest of the universe. Optimus Prime is all that stands between him and victory, and the Autobot leader has done a poor job of hiding himself. At long last, Megatron knows exactly where his enemy is, and he has power enough to destroy him.