The Civilization series has always been a big favorite for Mac gamers and today it was announced that the latest game in the series, Civilization V, will be making its Mac debut on November 23. Aspyr Media is handling the publishing and development of the Mac port of Firaxis Games' turn-based strategy title. The system requirements for the Mac port include installing the Steam client which would suggest the Mac port will be made available on Steam at some point.
You can go ahead and pre-order the Mac port on Aspyr's GameAgent.com web site for both the download and box copy versions. And if you pre-order the game you will be put into a special drawing to receive a boxed Mac version of the game's Special Edition that's signed by Mr. Civilization himself Sid Meier. Also, all of the previous Civilization games for the Mac are currently being sold on GameAgent.com for 50 percent off.

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