You need to install an update from Software Update first. Â Then Restart. Â Then go to the Dev Center and get a redeem code. Â Then go to the Mac App Store, redeem and download. Â The download is 3.7GB.
Apple also released Xcode to 4.1 Developer Preview 2: [Both OSX Lion Preview 2, Xcode 4.1 Developer Preview 2 Are available for download here]
Here is our first image of the redesigned iCal:
