And now something a bit different,an official statement from high ranking principal member of technical staff at AMD regarding Bulldozer's key improveemnt :


The next big turn of the screw for AMD will involve plugging its next-generation Bulldozer core into a Magny-Cours design. The new core expands what has been the single-threaded nature of the AMD cores "in a different fashion than Hyperthreading," said Conway, referring to Intel's method for supporting two threads on a core.
There's a glimpse of CMT definition somewhere in that statement .