Theo over at TGDaily's got the goods on AMD's next card, the 4800, which, according to their sources, will launch next month. They've got all the technical details, including this tidbit:

"The graphics processor itself will integrate more texture memory units (TMUs), which is the Achilles' heel of the R6xx generation: 32 TMUs in the RV770 will challenge the 56/64 units of Nvidia’s G92/G92b."