The acid test will be when the GDSs and Star Alliance carriers start to compile schedules for flights to/from the new terminal - which may already have happened as it's less than a year now until it opens.
IATA defines 1-2 character alphanumeric codes to denote terminals (where an airport has more than one), so "QT" or "Q" could legitimately be used, or alternatively just "2" to be consistent with the other LHR terminals.
Given that the official announcement talks about "Terminal 2: The Queen's Terminal", my money is on the status quo.
Last edited by DaveReidUK; 29th Jun 2013 at 18:04.