But a flashback to cybertron wouldn't explain Sam being in it and held down by Megatron. I believe it's Soundwave that tries to rebuild Megatron to lead the army once again and Starscream is against it and builds his own team.
you figure they would have to finally give up this misinfo bull, after the first trailer was broke down clip by clip then the key chain from the toy expo.
This is going out on a serious limb. Soundwave, considering his undying loyalty to Megatron, probably came to earth and used Ravage and other minions to save Megatron from the abyss (thus the carrier scene and Ravage emerging from the water), meanwhile, Starscream knows what Soundwave is doing, but also knows that he needs more power to crush any opposition towards him. So, he figures out the Fallen is on Earth and figures he could resurrect and control him, since everyone knows Starscream can be arrogant. And of course, the Fallen is gonna dick everyone over and take on the Decepticons and Autobots. I know its out there but I figured I'd add my two cents.
I've heard Orci likes Unicron and would love to work him into a TF3. The Fallen's background is being one of the original 13 TFs who sided with Unicorn. Who wants to bet that the Fallen ends up being a herald for Unicron who was stopped somehow before he could make the world ready for him? My guess is he gets used by Soundwave's team to revive Meg's unaware of this and the process causes inadvertedly wakes him up all pissed off about it, RIGHT in the middle of an all out war between the Decepticons and Autobots. Megs being to possessive megalomanic that he is, ends up in a three way Brawl between Starscream and the Fallen for leadership of the Decepticons. Megs kills Starscream, uses Devastator and a deal with Prime to take out the Fallen and then everything seems to be back to Cybertronian war normalcy, when you find out Unicron felt the Fallen's death and is on his way for TF3. The scene Bay and co. have been tossing out there as a last minute surprise that would knock fans off their feet? Last scene of the movie, possibly just before or right after the credits... Unicron changing course. I mean what's a TF saga without Starscream's death, a revived Meg's and Unicron? Just my .02. Oh and the pic people are speculating is the last fragment of the allspark? My guess is that's Lennox's team investigating an aircraft carrier that resurfaced after vanishing from sight. Either the Nemesis ship or Tidal Wave.