I think it is unlikely that Sony will provide a SDK. They never have. As far as the pro market, Sony has never been a pro camera in the way that Canon and Nikon are. If you shoot Sony, you are on your own. When I bought into the A900 I had hopes that would change, but it hasn't and I don't think it will. That isn't to say we shouldn't use Sony, just that we are kind of on our own in many ways.