A340's will be operating the service.
QF (and other airlines) tech stopped at STN recently due to the fuel farm near Milton Keynes going bang, so the rwy is long enough for a 747-400 doing STN-BKK/SIN.
Plenty of long haul cargo flights operate from STN as well as passenger flights to the Middle East and the America's.
Stacks of short haul (up to 3hrs) to Europe with LCC's with next to nothing fares.
Don't go to STN looking for photo ops, there aren't any
But if you want to see a lot of Ryanair 737-800's this is the place
Most of the time the terminal resembles a major Indian railway station and isn't a very nice place to linger, but it is only 3 mins from my cousins house