I have a canon P9000 MKII and I too am waiting for the release of the new drivers. I tried all sorts of work arounds to get that puppy to print. In the end, I restored my leopard backup and shelved SL until I get those drivers in hand.
Give it time, canon will release them. Don't forget, apple threw everyone a curve by releasing SL early. Many of the vendors were putting the final touches on their drivers/apps for an october release and boom, apple unleashes snow leopard in August.