May I refer you to my own opinion on AMD's roadmap?
http://www.vgchartz.com/forum/thread.php?id=49026
12-core sounds good but, seeing as most applications barely take advantage of two cores, twelve is not going to be much better. Each core will probably lose to Core 2, definitely lose to Core i7 (Nehalem) and be decimated by 32nm Nehalem in 2009 and Sandy Bridge in 2010.