Apple has today released a seed of OS X Lion 10.7.2 to developers. This version of OS X Lion includes support for iCloud and is beta software that allows developers to test iCloud integration with Mac and iOS apps. The downloads are available on Apple’s Developer Site.

The new Lion update, which is build number 11C73, is a pre-release version of OS X Lion 10.7.2 provided solely for the purpose of testing iCloud features and is not an official update build. If you’ve installed any previous versions of 10.7.2, you have to revert back to 10.7 using the supplied tool before you update.

Screen shot 2011 10 04 at 12.12.01 PM 520x103 Apple seeds OS X Lion 10.7.2 GM 11C73 with iCloud to developers

The last update to OS X Lion and iCloud for Mac came a couple of weeks ago. This update provided solely for the purpose of testing iCloud features and is not an official update build. If you’ve installed any previous versions of 10.7.2, you have to revert back to 10.7 using the supplied tool before you update.

Lion with iCloud will integrate with the new iOS 5 software that Apple is releasing on October 12th.

This new version of iOS 5 contains features of iOS like iMessagesTwitterSetup and Notification CenteriCloud and alerts. It also contains the Siri assistant feature announced today, but that is compatible only with Apple’s iPhone 4S, a new device being released on October 14th and available for pre-order on October 7th.