No, i think they will be two separate entities one on each side of the players entrance.
I thought maybe that someone on NSC might join the "Tunnel Club" and report back but then realised if they did so they would be breaking the first rule.
I have not seen any but i am guessing that the way they are digging down they will be creating a new lounge and catering area under the seating which will have a glass window on one side looking into the tunnel and a stairway to directly access the seats above it. Though that being the case i am...