Borderlands 2 will be available for full download on the release date which is September 21.  The downloads at the moment will be only be available for PSN, now word on Xbox live.

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Borderlands 2 will be downloadable on PlayStation Network in North America on its September 18 release date, the PlayStation Blogcast revealed. It’s also available for pre-order on PSN in Europe right now, for release on September 21. That makes the PlayStation Plus release of Borderlands a really smart piece of marketing.

[joystiq]