In the 2011 CIP you will find all the information on the Old control tower demolition. (page 48)
http://www.baa.com/static/Heathrow/D...P2011_Full.pdf
Also in the 2011 CIP are the plans for T2C and T2D.
Found in the CIP for 2009-2011...
http://www.baa.com/static/BAA_Airpor...e_Document.pdf (page 158) T2D
http://www.baa.com/static/BAA_Airpor...20document.pdf (page 312) T2D
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.
It's all in there! and I assume if a R3 is ever built T4 and the cargo will get overhauled/rebuilt perpendicular/parallel to the runway....who knows