My Theory could they be The Dinobots aka Grimlock ect as they do look evil and got spikes and guns ect...
"Me Grimlock, Dinobot, me no car.... Me sexy Dinobot!" "Me Sludge, want to be sexy car!" "IF ME GRIMLOCK SAYS WE DINOBOTS, WE DINOBOTS!" Loollz, Basically saying Dinobots will not be cars.... Plus Bay hates them.... And the Dinobots hate him back...
I was having a discussion in the thread from the main page and I figured since it's so close to this thread's discussion I'd post it here as well. No point in making a new thread when there's one right here, no? ^_^ - So (hypothetically) let's go and say that the transport rig IS Motormaster and the Impala a few posts back IS Dead-End. I think the three Nascar vehicles could easily be Breakdown, Dragstrip, and Wildrider. Here's my reasoning as to why I think this may be possible. Wildrider - Red and black color scheme that resembles his G1 counterpart. Wildrider was originally a terrorist, and this here is a Gillette car. They make razors, and razors cut things. Dragstrip - The colors are not G1, however Dragstrip is the most hyper of the Stunticons. He's a speed-freak, and this is an AMP energy-drink car. Breakdown - Like Wildrider, this car has a close color-pallet to G1 Breakdown. Lowe's is a hardware store, and when things break and need fixing, you can go to a hardware store to buy parts and tools. Makes sense, no? ~Z
Autocon has a great point, and really shows how it would work out. I really hope Lockdown shows up somewhere though, as I don't really care for Dead End.
I can definetly see them as Stunticons, though I'm suprised they'd have a lesser known Combiner team in the films. Lockdown isn't likely at all. Even though Bay hates the Dinobots - God knows why - that's an interesting idea for Dinobots as those cars. But I'd expect something bigger for Grimlock.
I think they might be the Junkions (hence no apparent faction symbols) but the Constructicons didn't really show the symbols during filming. We forget some of the stuff on the vehicles will be added in CGI. I just hope they're Transformers and not some lame human creation. Like most other peeps, I really hope they are the Stunticons.