Wowsers, I wonder how well that can possibly work? A REALLy powerful vac hooked up to it may pay some dividends but it just doesn't seem practical. With the introduction of the multimaster, any cuts in an area that needs to be dust free, I see that as the best bet. Easily controlled, very little colateral damage.
I could see where it would be handy, othertimes not so much. We have definitely used a shop vac next to a sawz-all before to control dust. I think from what I saw on the video clip it should have plenty of visibility.