I think that there's lots of users out there who will LOVE the 10fps and improved focussing of the MkII, and I reckon it will be another hit for Canon.
I was waiting for this to come out as I want to get a good Canon SLR for videos, as I do a number of events, but even though I know it is a superior camera with the dual processors etc., I think the flip out screen and built in wireless of the 70D will suit me better.