The functionality to make it possible to change the name of an O365 tenant, especially with Sharepoint Online in mind, is being planned. There is no ETA at this time though.
An error occurred while saving the commentPaul commented
at the very minimum, we need to at have the ability to add new Sharepoint Site collections for any domain we verify in office365. For example: A tenant with a SP Site URL of myLLC.sharepoint.com and myCORP.sharepoint.com