Been thinking somewhat hard on where these newer Transformers movies have gone how might the next movie could work introducing the human element trust already achieved. The Autobots being receives as heroes and friendly. Where Unicron and the Maximals may take a more background approach while giving a HUGE tribute to the 86 movie and making Megatron the center stage.
So far we went from Bumblebee taking center stage. Then Mirage with Rise of the Beast.
Megatron needs to make his presence KNOWN make deals and taking down a few Autobots while being repaired and going through his dilemma of being repaired each time! Then let's end it with the wrath of Galvatron with a new hidden agenda not even the viewers are aware of...and the Matrix passed to a very unlikely Autobot with an ego.
While having a soft intro to the Joe's and Cobra (though Cobra never really mentioned but maybe have the symbol being flown on flags at the hidden base entrance that Megatron blows completely up on his exit after being repaired).

Note: this is all speculation on my part and probably would never turn into this, but it would be nice....

**If you have NOT seen RotB there are major spoilers here.
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https://www.youtube.com/watch?v=4B7VoBuZelw