We take this to mean that filming is completely done on Transformers: The Last Knight, as Bay suggested in his most recent Facebook post.
So there’s a contemporary element to this new Transformers.
The sequel — the fifth in the ongoing franchise — remains a bit of a mystery, and everything that we end up hearing about it only raises more questions.
For example, Mark Wahlberg continues playing the awesomely named Cade Yeager from Age of Extinction.