I found something online that is from a "call sheet" for Transformers 2, and it lists some bots, and descriptions, I'll paste it on so it's direct.
"Arcee - a motorcycle (which, for fanboys like me, we know is named after the only female Autobot in the original Transformers: The Movie)
The Twins - an Ice Cream Truck, which sounds incredibly goofy, until you read the description of what they do
Stinger - possibly a Porsche, but unconfirmed
R8 - character's name is unknown, but transforms into an Audi R8 (I knew Tony Stark wasn't the only one who'd have one of these)
Wheels (or Wheelbot) - possibly some kind of Go-Kart (let's hope it's not like Wheelie from the original TF
most annoying Autobot ever, besides Blurr)
Jetfire - a Blackbird jet (which again, is just plain AWESOME that he's in this)
"Constructicon Earth Mover" - name is unconfirmed, but if that's true, we'll probably get Devastator (Constructicons, not the tank in the first movie)"