No headway has been made on an app, because Dynon isn't working on an app. Or at least, they haven't indicated they are, and I seriously doubt they are. Airspeed data can indeed be exported via wifi, as vlittle noted, but using it elsewhere is dependent on the device or app receiving the data. Dynon has no control over that, and I'm not aware of any third parties working toward anything like that. Apps for iPads are even more constrained by the tight control Apple maintains over iOS app development. It helps with stability, but severely hampers development, much like FAA certification hampers GA aircraft development. If you want to read an airspeed indicator in the rear cockpit, you're likely limited to another Skyview, a different hardware solution entirely, or implementing what vlittle displayed, a homebrewed solution.