It's unlikely that we will implement WiFi. The A7S is a great camera (I have one too) but the Sony SDK is pretty awful. There are only 2 applications that I know of that support direct tether with the A7S and they're both very expensive and not geared towards astrophotography. The wifi connectivity is also pretty bad as you have to be directly connected to the camera, which means no internet connectivity for that PC while shooting. Which is bad if you want to use an online solver. Plus, in my experience, the WiFi was pretty unreliable.
So what you would likely end up with is a pretty horrible experience which would require numerous hours of support from us. And in the end it's not worth our time to go down that route.
Thanks,
Jared