I can't see that happening, if users have the ability to swap the motor settings between 27.5 and 29 wheels its going to be extremely easy for people to set the bike to 27 and gain extra assist speed from using a 29 wheel. granted it will only be a small gain but its still above the legal limit and will undoubtedly result in law suits and claims againt trek, especially over in the land of the free.
I guess it'd be a bike shop software change rather than a user one for wheel size and circumference.
Gordon