Producer Lorenzo di Bonaventura recently sat down for an interview with Beijing News about Transformers 4 and officially gave a confirmation about the mostly confirmed by evidence Dinobots.
"I can not disclose the specifics, but you can be sure that the joining of
the Dinobots will give the audience new excitement. In addition to
Optimus Prime, Bumblebee, the appearance of these classic roles
changed, today the world's coolest, most exciting cars will appear in the film,
including China's vehicles, whether you are a car enthusiast, you will feast
your eyes and be shocked by them."