If it weren't for the report that says it's a Lexus concept, I would have thought it was an Audi R8; perhaps like a 2009 or 2010 model (since not out yet and could differ) due to a slight different fascia.
But then again cars copy each other off these days.
-Regards
http://autos.yahoo.com/auto-shows/detroit_auto_show_2007/33/Lexus-LF-A-Concept