T2
There is a masterplan for the airport in development. We 'know' that it involves pretty much demolishing T1 and T3 and starting again. In order to facilitate this, T2 will need to handle larger demand whilst works are ongoing.
Rumours to date suggest an enlarged check-in, security and shops which is no surprise. They also suggest extended T2 to link with the T1 lounge area and on the other side towards the motorway.
It's likely that Pier C will go early on the redevelopment to facilitate better access to/from T2.
I'd love to see plans for all of this. If only the airport would release a timescale for it all.......