As far as I know none. With eyefinity 2.0 just released you likely will not see something like this until the next gen at least for AMD. Maybe Nvidia might have a surprise with the GK110? Although Nvidia seems to have less focus on this front than AMD.
While this isn't possible with Surround/Eyefinity you can do this using a "hacked" together solution. For example running the game in windowed mode spanned across the displays.
Interesting I'll try that out just too see what it looks like. This solidified sticking with my 460gtx sli setup and skipping a few generations of cards.