Nobody?
I'm surprised as well, quite a few on the forum print from Macs to Canon.
I'm not using a Canon, but just a thought. Apple didn't change much to the core printing between Snow Leopard and Lion, and I've only seen a few "anomalies" with a few users and their printers when updating to Lion. Epson didn't have to update their recent drivers to make it work.
Yeah, I know ... not much help. Maybe you could clone your hard drive before updating just to be safe.