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I doubt it will require 2x Cards as the new cards have 2 x DVI port and a mini HDMI so theres no reason to believe it won't function similar to Eyefinity.
ATi pulled a fast one on nVidia with Eyefinity. They kept it absolutely secret until the last minute, meaning that nVidia had already designed the chip before they learnt of it. Presumably the mini-displayport is linked to the same output as one of the DVIs in the same way as ATi's boards.nVidia have already confirmed that surround vision, 3d or not will require sli to drive it.