In an EE Times video interviews with Fred Weber of AMD he speaks to multicore K9, and the advantages of multicore specifically the advantages in regards to parallel work. He also talks of the 65nm work, and research down to the 20nm range. Larger caches, multiple cores, more memory control, and more transistors are benefits to these smaller processes. K9 will be designed for 90nm moving to 65nm. These are some great videos to check out so please do.
The videos can be found here
Thanks to AMDZone for this one!