Apple has published an FAQ (frequently asked questions) about MobileMe to iCloud transition.
What’s happening to MobileMe?
The core services provided by MobileMe have been rewritten to work seamlessly with iCloud. MobileMe will no longer be available as a paid sync service. If you had an active MobileMe account as of June 6, 2011, your service has been extended through June 30, 2012, at no additional charge. After that date, the MobileMe service will no longer be available.
iCloud is Apple’s new cloud service, which stores your music, photos, apps, calendars, and documents and wirelessly pushes them to all your devices. iCloud integrates seamlessly with your apps, so everything happens automatically. iCloud will be free for iOS 5 and OS X Lion users.
New services in iCloud:
iTunes in the Cloud
Documents in the Cloud
Automatic downloads and purchase history for apps and books
Backup and restore
More information is available at www.apple.com/icloud.
More info: www.apple.com/mobileme/transition.html