The Brockley Hyperloop
Citymetric has had a crack at developing a detailed map of the proposed new orbital railway, which would make use of the Brockley Station high level platform. This is their informed guess, based on existing rail infrastructure and the unhelpfully vague map provided by TfL. They admit it could be wrong, although the stuff immediately around Brockley is almost certainly correct.
A direct train link to Lewisham, Blackheath, Nunhead, Peckham and Dulwich would be a massive result - not terribly useful for work, but great for play.