Looks like its true, only person to return from the original cast is Tanner Foust. And its going to be on the history channel...! Not sure how I feel about the other two, and you know they had to throw a NASCAR guy in there. Here's to hoping it won't suck!
http://transmission.blogs.topgear.com/2010/04/21/topgear-usa-alive/
http://transmission.blogs.topgear.com/2010/04/21/topgear-usa-alive/