I’ve made a slight change to http://bikes.oobrien.com/ – now, if a docking station gets added to the official map and then removed (which seems to be the case for the Phase 2 expansion testing, and also infilling some other areas) then it remains on my map as a “ghost dock” with a grey circle.
The data quality is poor, as the testers are frequently (about 25% of the time) getting the name and/or location wrong, but it gives some indication of stations that are likely to go live “for real” sometime soon. So far, though, the process has already identified 61 such “ghost” docks – a few of which have become fully live now. The latest are Lancaster Gate (Bayswater) and Manresa Road (Chelsea). (Unfortunately the latter’s entered location is extremely wrong and the entered dock size is 0, so it’s not currently showing up on the map.)