I ordered my 600mm II two months ago and I still have no word on when they are coming to my Canadian dealer. I would agree with the sentiment about how can they keep coming up with new lenses when they cannot keep up with the demand for some of these that were announced many months ago.
I wish there was some way we could get some response from Canon themselves, because I tried an e-mail to Canon Canada's Customer Service and was told that they don't have any information on this type of thing and that I should contact my dealer. I tried to tell them that my dealer did not have any information and I simply got the same old "check with your dealer" response - so much for "Customer Service". If I wasn't so "locked in" to Canon equipment, I would be looking at Nikon, but then maybe they don't deal any better with these problems - a case of better the devil you know than the one you don't