The traffic management page has already been updated but surprise surprise it's got some wrong info on it
http://www.virginmedia.com/help/traffic-management.php
Quote from Alex Brown
This applies to cable customers only, and we will commence the rollout
when all the customer communications are finished. I'll drop by to
update people at this stage.
Looks like full rollout once they've sent the letters out to the people using their service.