Here's some info about the K10 and Agena FX, coming from a slide from AMD over at FUD Zilla:
AMD K10 architecture details:
AMD Agena FX details:
Native quad-core design 512KB L2 cache per core Shared 2MB L3 cache Enhanced AMD PowerNow Technology HyperTransport 3.0 AMD Virtualization (AMD-V) Performance per watt leader
We don't have the proof yet but if we can believe AMD the Agena FX processor will be able to take back the performance crown from Intel.
Fastest gaming processor Up to eight cores with AMD Quad FX Best performance with ATI CrossFire Perfect fit with AMD RD790
Another part that will be presented to the press in Tunisia is the new RD790 chipset. This chip supports eight-cores with a Quad FX system, CrossFire and some other neat things.