I think this is going to be very interesting. I can understand the benefit of it, but as an SEO, I also feel that because we are working in the dark it is as much a science as an art. To me, this just means I have to work on fine tuning what it takes. Also, I think it will be harder for those who play on the wrong side of the tracks to rank well, which in turn may make it easier for those who do to rank well.