Apparently, the successor to the Tahiti graphics processing unit will be something called Tenerife, after the largest of the Canary Islands in the Spanish offshore territory. It will be designed on the "Enhanced Graphics CoreNext" architecture, which could be a boosted version of the GCN used in the HD 7000 series.
The specs of the graphics cards based on it are 2,304 stream processors, a memory bus of 384 bits and 3GB of GDDR5 VRAM working at 6 GHz. The thermal design power is 250W, quite a bit lower than the 300W which NVIDIA's allegedly unbeatable Kepler is rumored to sport.
The stream processor count is quite relevant, since it more or less fits with the