Nobody's posted a proper gallery that I'm aware of so I'm afraid that you're going to have to wait a while. Based on the pictures we saw of Bay and Rosie holding him, you couls make a rough guess.
no way to know as no one here has one in hand yet so we have no measurements, my guess is the Cab/bot is somewhere between Voyager and leader class , just shy of the old Ultra class. and with the trailer its supreme class.