It is covered in this article:
http://vr-zone.com/forums/596654/amd...ull-glory.html
The Phenom II X6 will have a Turbo Boost like technology. Upto half the cores will be have their base clockspeed raised by 400MHZ to 500MHZ. The new Phenom II processors will work in AM2+ motherboards too.
A new triple core, the Phenom II X3 740 is also being released.