Last week I tweeted that maybe TfL have indeed listened to public pressure and sorted out Bow Roundabout, although looking at the plans more closely I'm now not so sure.
This video from TfL shows how cyclists have a green light to enter the advance stop box, in front of waiting traffic. TfL have mentioned that there will be a different signal phase for cyclists but in effect; there isn't. A green signal to enter the advance stop box is not a different phase for cyclists at all. A video shows how this would work, but what it doesn't show is how the traffic waiting will pile 'over the top' of cyclists as they accellerate hard away from the line (which traffic generally seems to do).
Frankly I'm not convinced at all that this junction re-design would work for any but the fastest of cyclists. If you're slow off the line or enter the advance box near the end of the traffic red signal phase then you're going to have a lot of traffic behind you immediately!
TfL have the chance to put a bicycle-only traffic light here, to seperate types of traffic on this dangerous junction, but this plan fails to commit to it fully - just 'nearly' getting there.
Cyclists in the City has a much more comprehensive post about this.