It's good to hear that the Tube scheme back on track, despite the best efforts of a man (Charles Windsor) who never has to travel on an overcrowded underground train network.
I know that it will extend it to Clapham Junction, and I am fairly certain that it will run quite close to my little patch of South West London. Such a shame that Transport for London's links all return a 404 error!
Fortunately, Hackney Council has provided a copy of the map. It seems that round this way it will run on existing lines but join up in quite an intelligent way. So, if I ever need to go to Canada Water I could probably knock half an hour off the journey. That would have been useful three years ago when I had to audit schools in that area!