spin off, Bumble Bee and a human.
How Dinobots live during their free time now < hard to believe they will be peacefully quiet.
Construction of Trypticon which no idiot knows. < at the end credits you see construction of Fortress Maximus as they skip Metroplex.
Oh and Optimus will be found dead, and some human will intervene to find out what happened. passes matrix of leadership.
The writer's hands are already tied from the initial movies so you can't go far, just worse.