I just got my Kickr Snap and have been playing around with it trying to figure how everything works. I notice after pairing the 520 I can select "indoor workout" and control the resistance. Does anyone know if an uploaded Trainingpeaks workout on the 520 will modify resistance to match the intervals? I tried with my workout for today but it didn't really seem like the resistance was changing. It could be that it was a tempo ride and the changes in intervals were too small to notice anything.
I went ahead and created a test ride in Training Peaks with super short intervals and huge differences in power. The Kickr Snap is in fact controlled by the workout within the Edge 520. The resistance changed drastically between intervals. Good to know for those using Training Peaks and the 520!