There is small amount of information regarding the new series of AMD 7000 series graphic cards, and it seems we will know more shortly.
Info about mobile versions is already out.
From what I can see, the frequency of the cards using new core (Wimbledon, Heathrow, Chelsea) are significantly lower than current 6000 series. Even lower than the LOW end 74xx series (which are only re-named 6xxx cards)
This might suggest much better optimized new architecture.
We have few weeks to speculate :)