A Huge Mistake
Here are some of the supercars that were there:
Lamborghini-M Concept (Ouch, the Road and Track article doesn't say anything about this being there!)
Aston Martin Rapide Concept (Again, no word in the R&T article about this baby being in Detroit either!)
I guess I could put some of the blame on my sources, but I won't - I should have just plain done my homework. Again, a huge "I'm sorry." Thanks to Auto Spies for helping to sort things out.