Transformers producer, Lorenzo di Bonaventura had something to say about Transformers 4 in a recent interview:
What about a Transformers 4?
DI BONAVENTURA: Yeah, you’ll see that for sure, too. I think it’s inevitable.
This is still not concrete news, but I expect TF4 to happen soon.
Thanks to SamWitwickyGirl for the news tip.
Interview from Collider.
Poster from unofficial TF4 FB page