Yes and no.
I say yes because I was able to get SLI working on the DFI Infinity 775 that we looked at last year but that was with hacked drivers. I wouldn't get a,motherboard, especially one of that price point, under the assumptions that there will be drivers available for you to use.
As sad as it is, your going to have to get a 680i board if you want a top level chipset that supports SLI.