During today’s quarterly earnings report to investors, Apple confirmed that the next major release of the Mac operating system, OS X Lion, will be arriving in the Mac App Store for $29.
OS X Lion is unique in that you won’t be able to buy it on a disc. Instead, the new OS will be purchased and downloaded from the Mac App Store as a 4.0GB file. To upgrade to Lion, you will need to be running Mac OS X 10.6 Snow Leopard with the 10.6.8 update applied.
In addition to purchasing the software from the Mac App Store, you will be able to upgrade every other Mac that you own without having to purchase another copy of Lion. Simply sign in to the Mac App Store with the Apple ID you used to purchase Lion, and you will be able to download the software again to a new Mac.