As I understand it as of now TC2 will be used for set storage. There is no permanent control room planned only 1 & 3 are to have money spent on the refit. Things change from month to month so its a wait and see.
Have heard that - but also heard other rumblings. Sharing a control room with TC1 or 3 would also make sense.
After all TC2 was never really properly upgraded to HD - and relied on rigging additional HD gear in it for much of its life. Shows booked into TC2 would regularly move to the HD TC4 if it was available because it avoided the requirement for installing the rented in HD gear, saving S&PP money, and was a nicer space for production to work in. (The other small studios TC5 and 7 were never HD)
I'm sure the option of parking a scanner to allow all three studios to run simultaneously would also be an option, as it is in PQ where they have more studios than galleries.
However being a small studio (relatively speaking) it almost certainly won't get the level of demand that TC3 gets.