Pre Order activation key will be available at the planned release date:
27 Sep 201216:24
Call of Duty®: Black Ops for the Mac will take you behind enemy lines as a member of an elite ...
Call of Duty®: Black Ops for the Mac will take you behind enemy lines as a member of an elite special forces unit engaging in covert warfare, classified operations, and explosive conflicts across the globe. With access to exclusive weaponry and equipment, your actions will tip the balance during the most dangerous time period mankind has ever known.
The Mac version of Call of Duty®: Black Ops includes the First Strike DLC for free, giving you 5 incredibly diverse maps spanning the globe, including 4 new multiplayer maps and a chilling new Zombie experience!
In order to activate this game, you will require a third-party 'Steam' account. For full details on how to activate please follow this link: https://support.steampowered.com/kb_article.php?ref=5414-TFBN-1352