I'd want to know how the Fallen went from leading the cons agains the followers of the other six primes to being hidden on the Nemesis and forgotten by the Autobots. I'd also want to know how Megatron met and ultimately joined the Fallen. Furthermore, I wonder if Sentinel and the Fallen knew about each other and if Megatron was truly loyal to either of them.

 

It includes all past movie characters, not just current or main ones. I remember blackout was built up to be a close ally and follower of megatron and was completely neglected and forgot about in stuff after the first movie.

 

The return of Jazz, Ironhide, Ratchet, Starscream, Shockwave, Soundwave, & Barricade.

And of course can we finally have Prowl in a film?

 

I'd like to see Spotlight movies/TV specials for the main Autobots and Decepticons that would tell us how they got to where they are in the films. Like, films/TV spots where we see Jetfire rebelling against the Fallen, Optimus and Megatron having their falling out, Starscream staging a coop against Megatron only to be put in his place, Lockdown capturing the Dinobots, or Bumblebee training to be an Autobot. Just some stuff to lend some context to the story and some much needed personality to the characters.