The Tube maps at the moment say " Heathrow Terminals 1,2 & 3" and then "Heathrow Terminal 4" and "Heathrow Terminal 5". So even though T2 is not open right now, they never took it off the maps.
I would imagine it'll just stay that way. "Heathrow Central" is a term, as far as I am aware, that is only applied to the bus station at T123.