We knew Apple was going to talk the next version of OS X Lion today but in addition to a nice demo of a bunch of the features, we finally got some solid availability details. First up is the news that you won't have to run out and buy a disc for this one — Phil Schiller announced that the new OS will only be available for download in the Mac App Store in July. Oh, but that is not all. It will cost only $29.99 to upgrade your Mac. The Developer Preview will be available later today, so we're hoping to take a hands-on look at that, but hit the break for some shots of the Lion presentation during the WWDC keynote.

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