It's possible that OS X 10.8 has not been tested yet. Canon does not include operating systems until they are tested. That does not preclude the use of operating systems that have not been tested.
Just use Google and Blekko to see if anyone has had success using OS X 10.8 and version 2.0 of the Canon 7D firmware upgrade:
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Updated. Works fine. Shot few photos, they got transferred to my Mac running OS X 10.8 without any problems......
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