First post by me, Artakha Prime!
-Less Bumblbee. Major role, but doesn`t speak. That`s genious, ain`t it?
-Unicron; How epic would that just be! Though, i don`t think it`s gonna happen. Look how much trouble they got with making Devastator. And he`s 100 feet tall. So, what about making a planet-sized giant, that transforms into a ball and eats Earth? Michael Bay goes

.
-Cybertron; If they made a fully CG animated scene, like they did in the part of ROTF where Megatron travels to Mars, where Starscream and The Fallen are located. But just bigger. But, again, that would perhaps be very hard.
-Other nice locations. I think many people are tired of all the desert. Jungle, anyone?
-More old-style Seekers. With designs like Jetfires, but diffirent.
-Some flying Autobots. It`s not fair that all of them must be earth-bound, while the Decepticons are soaring through the air as jets or helis.
-Dead Autobots. Please do not hit me, but why is it always the bad ones and the females who die? But just don`t kill Ironhide or Sideswipe.
-Another fight between Megatron and Optimus. But just as long as non of them die. Again.
-More animal-like Transformers. Like Dinobots, or those. Though, i don`t really see the point of transforming into a dinosaur, when the goal is to follow the
Robots in Disguise thing... Even the other Dinosaurs would look through it.
-Some character called
Artakha Prime. But then it`s more likely that Unicron appears in the movie, or Lea get`s a girlfriend.