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If you guys want a download indicator, click the "Purchased" tab in the Mac App Store.

580mb/3.74gb here
 
Ooh hey! Anyone who says to search for Mac OS in the App Store is right:
 

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CUPERTINO, California—July 20, 2011—Apple® today updated the MacBook Air® with next generation processors, high-speed Thunderbolt I/O technology, a backlit keyboard and Mac OS® X Lion, the world’s most advanced operating system. With up to twice the performance of the previous generation, flash storage for instant-on responsiveness and a compact design so portable you can take it everywhere,* the MacBook Air starts at $999 (US) and is available for order today and in stores tomorrow.

http://www.apple.com/pr/library/2011/07/20Apple-Updates-MacBook-Air-With-Next-Generation-Processors-Thunderbolt-I-O-Backlit-Keyboard.html
 
Have a look at the attached.. it looks as if the GM build is the same as the app store
 

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