I wonder if they're going to pull the same "The Transformers have been with us the whole time!" schtick like they did the last three movies as a hook. First it was Megatron in the hoover dam that gave us cars and cell phones, than it was the Transformers knowing us since ancient times by building the pyramids, than it was transformers on the moon which was the basis for the whole Apollo program. What's this one going to be? The Dino Bots crashing onto Earth millions of years ago that resulted in Dinosaurs becoming extinct? Maybe the fifth movie will establish that the Earth itself was a transformer all along.