Sorry I don't think we will see any till board makers support CF in M-ATX format. I really am glad to see M-ATX taking off. Not everyone needs 5 HDs, 3 DVD+RW's and a huge case to build a high performance tower.
DFI is rumored to be looking at this market segment, and also rumored to be releasing some soon, but no details. If you have a S939 chip, there was only 1 mATX SLI board ever made, and it's S939. I use it in my wife's SFF build, as we speak. eVGA NF44 board.