I never buy official strategy guides, because fansites are always better, especially civfanatics. I'm tempted by this, just because it will be available before the game. I think I'll just hope it is in stock at Best Buy or Gamestop, and just check it out in the store without buying it. I guess it should be in retail stores on Sept 10, right?
UPDATE: Spotted at Gamestop -
http://www.gamestop.com/Catalog/ProductDetails.aspx?product_id=78640
Price is $20 there, and oddly enough release date is listed as 9/14/10 for the guide. Includes a description that I didn't see on the Amazon product page.
"Maximize each Civilization's bonus abilities and units
Discover the path to Domination, Space Race, Diplomatic, and Cultural victories
Resource management tips improve your science, culture, and production
Follow efficient paths on the Technology Tree to unlock the best units, buildings, and World Wonders
Learn how to deal with City-States, new for Civilization V"