I just recivied CABLE NPE. Updated CABLE and ZWIFT. And is working well, the response is the same as you connect it via ant+ on pc. I have to buy it, but now i have zwift on my ipad/iphone (iOS) with controllable 
Has this feature been done yet? my windows laptop just died, so i have had to use Zwift with my iPhone (yes is small) - it does the power - but no controls.
surely this is available by now?
where did you get the CABLE from? from what i can see on Amazon they are sold out
cyclepowermeters (europe)
npe-inc (eeuu)
type it on google and add npe cable