Found some conflicting reports about it when the GT500/DTM merger was announced:
"While ITR had been in negotiations with GRAND-AM on prospects of launching a U.S.-based DTM series, it's believed those talks have subsided."
from the speed article announcing the DTM/SuperGT rules merge:
http://auto-racing.speedtv.com/artic...t-join-forces/
"The USA has a key part to play in the deal between the Japanese and German firms with a Grand Am tie up still on the cards. “Grand-Am has said that it will run stand alone races for us if we can find a way to get the cars there and make it work, so with six car makers now it becomes much easier, and with a common chassis maybe an american firm could join in and make a car as well” Ulrich enthused."
from RCE:
http://www.racecar-engineering.com/n...e-regulations/