Thanks for posting that number. I just called it and was approved for the upgrade from my current Blast service to Extreme service. I do have Triple Play and a Docsis 3.0 Xfinity gateway device so there was nothing that I had to change to qualify for the upgrade. I was told that it would take effect within 24 hours.
I live in Lusby, MD (Southern part of the state).
Mod Edit: This post has been removed from the stickied report thread. Poster provided no evidence of actual receipt, is unresponsive to IM requests and doesn't appear to be in the Central Region where the upgrades are currently occurring. Sunny