I wasn't paying much attention but I'm preatty sure that Robbie Koenig said in the start of the Fed Wawa match that London will have the same surface as Basel (also the same colour kit). Did I heard it right?
The same color - yes. That's why Basel and Vienna changed their court surface color, in order to have a homogeneous color (still a bad move I think).
I wouldn't be too sure with the speed. I guess the speed will be Valencia like, but with a lower bounce (so you could say: speed = Valencia, bounce = Basel -> slow and low, that was it last year).
Anyway everything's just speculative atm, we'll find out soon enough.