Oh yay, this was exactly what was missing from iOS.
Now I can customise my Xbox avatar on the go, because that is totally something I need to do on a continuous basis. Oh and communicate with my friends that don't have Facebook, Google+, Skype, a phone number, access to carrier pigeons or one of the over 9000 ways to communicate with people that doesn't involve the Xbox.
This right here, was the killer feature of WP all along. The OS is totally doomed now.