The short answer is "Yes, some time in the future we hope to have support for GCS running on handheld devices."
The shorter answer for those wanting something in the near future is "Probably later than sooner."
In the mean time, you should check out the new EasyTune feature (wait, I think that one is not released yet?) It allows you to tune P, I, and D all with one pot/slider on your RC transmitter. The result is the same numbers you got from OpTune and the like, but without manual copying / setting PIDs based on what a formula tells you from your UOV. In essence you are dialing a UOV on the tranmitter and it is setting the PIDs according to the XxTune formula.