Returning Autobots:
Optimus Prime: Still the same truck, but with a trailer now, which he'll be able to combine with.
Concept art:
Bumblebee: same alt mode.
Ironhide: same alt mode.
Ratchet: same alt mode, but painted green and grey now.
Sideswipe: new upgraded alt mode, a Silver Chevrolet Corvette Centennial Convertible.
Skids and Mudflap: alt modes upgraded to Black Chevrolet Sparks, with different colored stripes to tell them apart.
Black with green stripes, Skids:
Black with orange stripes, Mudflap:
Wheelie: still the same blue R/C monster truck.
New Autobots:
Silverbolt: alt mode is rumored to be a space shuttle, and voiced by James Avery.
A Ferrari 458 Italia, name unknown for now.
Sentinel Prime: alt mode is a Red/Black Rosenbauer Panther Fire Truck, but this could be misdirection from Bay.
THE WRECKERS - An Elite Autobot Strike-Team, they function essentially as a Commando Unit. The Wreckers consist of three members who transform into modified NASCAR Chevrolet Impala stock cars equipped with machine guns and armed to the teeth. They are known to be brutal and cause a lot of damage when fighting Decepticons. They are generally known to be the best and the toughest die-hard fighters around. The Wreckers tend to be a close-knit combat unit that consider themselves the best of the best. They're often called in to fight when the odds of success are slim. This is the first time they appeared in a live series other than comic books. The Members of The Wreckers are:
A Red #42 Juan Pablo Montoya NASCAR Target Chevrolet Impala
A Green #88 Dale Earnhardt, Jr. NASCAR AMP Energy/National Guard Chevrolet Impala
A Blue #48 Jimmie Johnson NASCAR Lowe's/Kobalt Chevrolet Impala
Wheeljack: alt mode a Blue Mercedes-Benz E550, Autobot scientist.
A Mysterious Robot with Yellow-Armor that appeared to come to life at the end of the teaser trailer. He is believed to be the hidden Transformer that Bay said the plot will involve.
Returning Decepticons:
Megatron: new alt mode is a Armored Rusty Mack Titan 10-wheeler Tank Truck.
Starscream: still an F-22 Raptor.
Soundwave: same satellite alt mode, but will be involved in battles this time around.
New Decepticons:
Shockwave: rumored alt mode is possibly a Jet Train, and he'll be the main villain.
A Superfund Armored Truck. It has been reported that this Decepticon will be involved in a bank robbery scene. His name has not been confirmed/Identified yet.
The Dreads: A group of Decepticon clones that transform into Chevrolet Suburban Emergency Vehicles. Only Four Dreads are known to appear and there is a possibility more will appear.