Developers testing out iOS 6 beta 3 are gaining access to an @iCloud.com email address. Those who were originally given an @me.com address will be given a matching iCloud email.
Here’s Apple’s wording on how it works:
icloud.com email addresses are now available for iCloud mail users. Users signing up for new Apple IDs, or enabling Mail on their iCloud account for the first time, will automatically receive an @icloud.com email address instead of a me.com email address. iCloud users with @me.com addresses that have been used with iOS 6 beta 3 will receive an @icloud.com email address that matches their @me.com address.
Looks like just another step in Apple’s transition to iCloud and the end of MobileMe.