This study, funded by Transport for London (TfL) would be the first major purpose-built dedicated cycling and pediestrian bridge over the Thames. The initial idea was mooted over two yeras ago on the back of the announcement that London was to host the 2012 Olympics.
The report indicates that the ideal location for the Rotherhithe-Canary Wharf Bridge is betweeen Durand's Wharf, a park on the Southwark bank, and Westferry Road.
At first glance I though that this was the area occupied by the Surrey Docks Farm, but it is not. It is the small area of greenery just down from there, off Rotherhithe Street. Here's a somewhat clearer map on Streetmap.co.uk. There should be a red arrow marking the park, but is if not it is the green rectangle about half way between the Farm and Nelson Dock.
It looks as though Whitbybird have put forward the design proposal.
There's also a model mock-up of what the bridge would look like, also on Dr Plockta's site.
The complete technical feasibility study can be downloaded from the Sustrans website in PDF format. Sustrans is a sustainable transport charity. I haven't had a chance to read the entire thing yet.