In iOS 6 beta 3, Apple offers users the option to register email addresses with the icloud.com extension

iCloud

  Starting this evening, Apple offers iDevice owners the option to register email addresses with the domain iCloud.com. The option is only available on iOS beta 6 3 and only for those who log in to iCloud for the first time, or for those who switch from the MobileMe service to the iCloud service. Apple offers users the option to keep the email username when they change the email services they use, so if you had an email of the form: name@me.com and you switch from MobileMe to iCloud, then the new email it will have the form name@icloud.com.

  • 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.
  • icloud.com email cannot be sent from www.icloud.com. Users should use http://beta.icloud.com at this time if they wish to send email from their icloud.com address using a web browser.

  Unfortunately, the new emails with the icloud.com domain are only accessible from beta version of the iCloud.com website, and of course you only have access there if you are a developer registered with Apple.