News and pictures of the new Terminal 5 at Heathrow, which is exclusive to British Airways:

Transition schedule (pdf 0.7MB)
Information (pdf 1.3 MB)
Lounges (pdf 2.9MB)

 

Tube access: the frequency of trains on the Heathrow branch of the Piccadilly line remains unchanged, with services from Hatton Cross to Heathrow split.
Alternate trains run either to Terminal 4 (around the loop and back to Central London via Terminal 123), or direct to Terminal 123 and Terminal 5.