Rumors are running that ATI may come out with a full cross section, from top to bottom for DX11.
Rumors on nVidia side are somewhat more obscure, tho, theres reportedly several DX11 cards in the pipeline, and its said theyre several to 3-4 months behind ATI.
As to any specs on any cards, its all speculation, nothings really confirmed yet, or close. It may have alot to do with ATIs surprise with their R700 family release, and the 480/800 shader thing, besides them just normally holding their cards tight to the vest. Also, LRB will be here eventually, and thats just another competitor to keep things from