I have doubts about the veracity of this report - a GTX 260 GX2 would draw a ton of power, and run extremely hot. I'm not saying its impossible, but I would be quite surprised if it were true, unless it also involved something like a die shrink.
 
Thats the problem, theyll most likely have to. Ive seen the pic, but Im not sold. Thisd be 2 400nm2 + di, on 1 pcb, with a plx chip and 2 512 bit buses, sounds like an awful lot on 1 pcb, oh, and add 2 gigs of ram to boot