Q: @me.com to @icloud.com email migration?

I think this might work.  Try logging into www.icloud.com and go to mail.  Then click the settings icon in the upper right corner and click preferences from the drop down menu.  Click the accounts tab and then click "Add an alias..."  This will pop up with a dialog box that lets you add an alias with @icloud.com.

I can't test this because I've removed an alias within the last 7 days and it won't let me add another alias yet.  I don't know if Apple will automatically migrate @me.com email addresses (I was under the impression this would happen also) but this might work in the mean time.  Let me know if it works.

Read this:

http://support.apple.com/kb/HT5441