I received an email from CBA:
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Complimentary Qantas Frequent Flyer Membership.
Qantas is the official airline for the Australian Cricket Team and loves cricket as much as we do. For a limited time, as a CommBank Cricket Club member you can join Australia's favourite loyalty program without the usual fee, so you'll save $89.50.
But you'll have to hurry.
Offer available only until 28 February 2015.
It seems to be open to everyone, as per the requirements in the link, despite what the CBA email said.
Woolworths have this offer