First up is Transformers 5 on June 23, 2017. It has already been confirmed Michael Bay will be back to direct this one (which he claims will be his last one again) and again will star Mark Wahlberg. The interesting thing about the date is it is currently the date Warner Brothers has set aside for Wonder Woman. It will be an interesting battle if both studios stick to their dates.
On June 8th, 2018 we will see what some thought would be Transformers 6 but turns out it will be a Bumblebee spinoff movie. No word yet on what the story will be about or who will direct it. Again the release date pits Transformers against a Warner Brothers movie, this time it will be the Godzilla sequel.
Finally we got a Transformers movie coming on June 28th, 2019. With absolutely zero info on this one it is pure speculation what it will be. Could be Transformers 6 or maybe the animated spinoff we have heard about. Also no word yet on any Warner Brothers movies it will be opening against.