For T2D this will mean demolition on the BMI, Virgin and BA "Cathedral" hangars and relocation/reposition of the maintenance facility.
The New hangars will be build perpendicular to the runways and take up a lots less room. T2D will be built where current hangars start and everything shifted to the east.
T5D will be built around 2018 and linked to the repositioned T3 parallel Pier.
Not sure "will" is the correct word, not all of this is going ahead, certainly not T5D and most assuredly not by 2018.