Some is from London at least, because I ended up behind one of the training cars a while ago.
I'm sceptical, but I'm not on the "never" path. It was going through one of the most annoying parts of my drive - for those that know the area, just outside of St Pancras heading up to Pentonville Road. At that point you have a lane split, comically bad driving, buses overlapping the lane, psychotic cyclists ignoring lanes and red lights and pedestrians on a tiny sliver in the middle of the three lanes continually trying to kill themselves in ever more novel and entirely unexpected ways.
If they tested it there and they still want to launch - huh. I'll be very interested to see it.