Joblo has another bit of insider news for us regarding the new Transformers 4 Autobots. The Bugatti Grand Sport Vitesse is rumored to be Drift and the C7 Chevrolet Corvette Stingray is rumored to be Slingshot. The admin of Michael Bay's website responded to the rumors with this:
“This is the 4th movie, you would think these guys would've learned by now
that production names DO NOT EQUAL final name.”
This does prove that the news is legit, but as for now, Drift and Slingshot are only production names and are not the official names for the new Autobots.