Im theorizing on a whim here. We may have only seen three villains as on set vehicles. Nightbird, Battletrap, and Scourge. But we have five autobots, and four Maximals. We have an army of lanky skeleton things that are Terrorcons/Predacons. Scourge cant possibly be the main baddie. I feel like BW Megatron is out of the picture at this point because we would have seen some marketing or a toy reveal. And many theorize G1 Megs is our post end credits grand entrance. So who?