I am not sure why RIM is limiting this to NA Mac users but if you happen to be one head on over to the Beta Zone for the update. This brings us to v2.2 from the previous v2.1.2. I did not originally have the program available to me until I changed my profile in the Beta Zone to say I have a Mac. No words on what this update brings but RIM wants users to focus on the core functionality for testing.
You can pick up the update if you are eligible at www.blackberry.com/beta