I know about the new WeatherFlow PWS because I noticed it mentioned here in a post. It appears to be the shit with unlimited integration. So I pre ordered one for my first PWS. It has native WU support, so I know I can use Carl's approach to transferring the data to PWSWeather, to which Rachio has native support.
Has WeatherFlow been researched by your team? I've read about the openness that is coming in V3, could this new PWS be directly integrated to Rachio in V3? I'm pretty sure I read where you can make direct calls to the device as well as API calls to their server.