many of you guys forget that the gfx cards coming out end of year 2010 were supposed to not be on 40nm,as originally designed by AMD...
then TSMC said it has problems with the smaller process and AMD was able to redo partially the current release somehow.
my guess is that they will be making good money both on the 68xx and 69xx.
so in a way i guess,Barts and Cayman are plan B