Tfl have released a new tube map with London Overground on..

http://www.tfl.gov.uk/assets/downloads/colourmap.pdf

Heathrow Terminal 5m Langdon Park, Wood Lane and Shepherds Bush (LO)
appear as under construction.

Hatch End to Watford Junction are depicted as outside the zones (not
even in A-D). "Special Fares Apply"