Apple has seeded OS X Lion 10.7.2 build 11C55 to developers today, and it is the first OS X Lion 10.7.2 build to include iCloud for Mac built-in. Previously, developers had to download a separate iCloud for Mac package.
OS X Lion Software Update 10.7.2 is an update to OS X Lion 10.7 and includes support for iCloud beta. Please refer to the seed note for more details and installation instructions. (Mac Developer Program membership is required)
OS X Lion 10.7.2 includes the ability for users to easily enable iCloud Mail, Contacts, Calendar, and Find my Mac on their computers. The software release will most likely ship alongside iCloud sometime this fall. Apple’s iCloud service is seemingly almost ready to launch with both Apple and carriers (for the iOS 5 integration) already being trained on the matter.