Apple has released Mac OS X 10.7 Developer Preview today to members of its developers' program, Mac Developer Program. The first available build brings in many new features expected in the public release of Mac OS X 10.7 of Summer 2011 including: Mail 5, full screen apps, launchpad, Mission Control, gestures and many more features. Is anyone here in the developer program? It's a download via the Mac App Store. A promotion code is generated for you to download the build.