Transformers 6

Transformers 7 is the sequel following The Last Knight from from Paramount.

Plot
Unicron has now awoken and the Autobots are trying to stop him.

Why It Was Cancelled

 * 1) Due to the negative reception and the low performing of The Last Knight, Hasbro is looking to reboot the franchise with a new director and now never letting Micheal Bay laying his hands on them again.
 * 2) Hasbro was now listening to their audience how the Autobots are very cruel and the Deceptions are a bunch of motiveless "baddies" who have the potential to die on sight.

Autobots
Optimus Prime Bumblebee Hound Drift Crosshairs

Decepticons
Megatron

Humans
Cade Yeager

Result

 * 1) The Bumbleebee movie was originally gonna be the last movie in the Bayverse but soon it was changed to reboot the franchise.
 * 2) Hasbro now wants no connections with the Bayverse so the story is entirely changed and the Transformers are gonna be redesigned.