According to an article which has been posted on www.game-debate.com, there will be 6 new GPU series coming from AMD this fall.
They name "HIS" as the culprit for the leaked info about the cards.
"HIS accidentally posted a host of new cards in its coming soon section, including the hotly anticipated flagship card detail as ‘R9 280X iPower IceQ X ² Boost Clock 3GB GDDR5 PCI-E DLDVI-I/HDMI/2xMini DP’."
//bayimg.com/haPnmaaeJ
The equivalent to the HD7970 seems to pack no more than 3GB of GDDR5, which I think is a bit disappointing - but remember this is still unofficial data.
"It's believed that much of the new range will rely on the older and cheaper Pitcairn and Tahiti dies, with its flagship Hawaii being the only new part to compete against NVIDIA's GK110 core."
Sounds disappointing.
"The full range of leaked APUs is as follows:
AMD R-290 (Replacing HD 7990 Flagship)
AMD R-280 (Replacing HD 7900 Series)
AMD R-270 (Replacing HD 7800/7700 Series)
AMD R-260 (Replacing HD 7770 Series)
AMD R-250 (Replacing HD 7700 Series)
AMD R-240 (Replacing HD 7600 Series) "