Here's one of my maps that I recently did showing two of the changes to the Tube network that in official plans. The Bakerloo re-extension back to Watford junction and the Circle Line being turned into a "T-cup" services, Basically it runs from hammersmith to Edgware Road via Wood Lane, Paddington, King's Cross, Victoria and the back to Edgware Road agin. This has a few issues including no direct train from the west side of the Circle to stations east of Edgware Road (I.E. Baker Street) But it will help keep the Circle Line more robust in times of service problems as well as doubling the frequency of the Hammersmith branch. Oh and if your wondering why the map looks so weird its because its the Tube network not the TfL transport network (what is currently on the Tube map).