Dpreview posted an interview they made with Canon Manager Tokura. I will quote the part regarding the mirrorless future:
There are some features, such as AF, which have not yet caught up with DSLRs, so given the current state of affairs it would be a little unrealistic to say that we will suddenly start offering a professional mirrorless camera. There’s still a performance gap that needs to be addressed.
This is just my personal opinion. In my view there are two key features that have to be addressed. The first is autofocus, particularly tracking of moving subjects. The other is the viewfinder. The electronic viewfinder would have to offer a certain standard. If those two functions were to match the performance of EOS DSLR camera performance, we might make the switch.
Well of course Tokura is probably just hiding his cards form the eyes of the competition…