Okay first of it's only speculation I could be completely wrong. Some even don't have evidence to support them, actually that applies to most of them. But let's get started, I really how you guys feel about them! 1. Optimus Prime is not Optimus Prime! Yeah, yeah I know it has been suggested before, but what if Optimus isn't really Optimus and a clone that was built by the Creators when they captured him. The real Optimus knows that but is pinned down and is unable to help his friends. He is being held captive in their ship and through the whole movie sees what his evil copy does on Earth. The Optimus from the trailer (the one with the purple eyes) looks kinda different, he has a scar on his face, as someone already pointed out, and his design appears slightly distinct, I dunno really how to describe it, something is wrong. So yeah that thing that attacks Bumblebee is not Optimus, it's an evil version of him! 2. Earth is a mechanical planet! Just like Cybertron, Earth is a mecha-planet. It's core is the key to restoring Cybertron. Simply the two plantes have to merge. That planetary monster thing in the teaser is actually Earth in the past, arriving in our solar system. It collided with one of the planets which resulted in the formation of the asteroid field. 3. The Dragon is a defender! The dragon creature that first appeared on the poster with Optimus is actually a good guy that has been dormant since medival times. It is from an antient race which was originally inhabiting the mechanical Earth. So in that poster the dragon is actually the defender and is defending the Earth from the evil Optimus. 4. Megatron saves the Autobots! I just don't know but I have a feeling Megatron is gonna help the Autobots this time. While at first he might be pleased to see Optimus Prime doing such cruel things he still wouldn't want to team up with him, as he has always wanted everything from himself and the creators would be an enemy to him, that's why he would temporary form an allience with the Autobots. I dunno, I saw him in a scene with Lennox, he didn't appear to be killing him, well he seemed angry but maybe he ultimately agrees to help him. It also seemed like Lennox was offering him something, again I could be wrong. Megatron then teams up with them and the dragon. 5. Anthony Hopkins is indeed Merlin! He has lived up to modern days through some alien technologie that was given to him, thus creating the legend that he is a magician! Also the dragon is his guardian. Maybe has the key that activates Earth's core. Remember that scene where he is in what appears to be knight order room, or something like that? 6. Bumblebee dies! Yep, Bumblebee dies, it's crazy as this. I personally do not believe that it will happen, or at least it won't have a perminent effect, meaning that he will get revived, maybe. The biggest evidence (sorta) is when Optimus stabs him (possibly). His death will change a lot of things and a lot of other characters, especially Optimus and Hot Rod, since Hot Rod is his buddy! 7. Santos is a relative to Attinger! Yeah I really have nothing to say about that, just seemed crazy to me. There's a slight chance it is true. Maybe he wants a revenge on Attinger's death and is just continuing his work? 8. Megatron is the last Knight! First of all I'm not a fan of Megatron being a knight as well. It was a thing that made Optimus unique, something above Megatron and now he is a knight as well. Maybe nobody realizes this, that the key to stopping this new threat - Optimus is the last knight - Megatron. Maybe even Megatron doesn't know this himself. When the Autobots and Cade learn this from Anthony's character they offer him a truce, since he's their only hope. "Optimus Prime has left us" - not in a way that is physically not here, but has left the good guys and is therefore no longer a saviour. 9. Megatron and Galvatron are NOT the same! No evidence, just wild speculation. I doubt that it will turn out to be true, but sounds so absurd that might work. It would be awesome if it actually happens. 10. Megatron travels back in time! This is how he reunites with his former warriors. Shockwave, Barricade and the dreads maybe other as well. That's it.