Guesses on the "secret location" appear to be favouring Warren Street. So if you're travelling through the station today on the Victoria Line look out for the sensors on the tunnel roof.
Wi-Fi has been promised at 80 stations. The Virgin Media contract is only for ticket offices, escalators and platforms
because it would have required major construction work to have added
connectivity to the network's tunnels. But if you are on the Tube in an
area within the stations covered, there may be enough range to pick
up a connection on a train itself. 120 stations will be fitted out by the end of the year.
After the period of free access to all during the Olympics, Virgin Media's broadband & mobile
customers will get continued access as part of their subscriptions.
Other non-paying users will be limited to a site showing online travel