As I just wrote in another similar thread, I really wish that Apple would lend engineering support to companies like Canon to make sure that their products work with the latest-and-greatest.
I'd love to upgrade to Mountain Lion today, but I won't until I can shoot tethered. And, if you think about it even a little bit, those who shoot tethered are the "creative" ones who spend lots of money on tech stuff, presumably Apple's most-coveted market.
b&