personally I'm tired of the companies thinking that the solution to better system is to double everything up. They need to focus on heat and making things smaller if possible, not simply building an architecture to house two GPU's, CPU's or SLI...I mean who the hell can actually afford a SLI-Board and two 6800's or even 2 freakin 6600GT's for that matter...and of course the dual GPU card will be damn near just as expensive.
I think it's worthless to head into just doubling it up unless this is their way of buying time to create a better more efficient architecture.