It is a marvel.
Q1. Yes it does, I have mine hooked up to a 64 bit win 7 system but you do have to download the latest mount hub pro software.
Q2. The din plug (S video Cable) on the QHY camera's run between the power box and the camera itself. (Quiy does it this way to keep the power board away from the camera to reduce noise). You must connect a standard 2.1 mm power plug into the power box to power up the camera. Luckily that is exactly the type that comes with the mount hub pro

. I have no idea how you would get around the SBIG din cable setup.
Q3. Yes the robofocus stepper plugs directly into the mount hub pro and is controlled either by the included hand controller in manual mode or by the mount hub pro software in PC mode. I have one set up on my scope and it works a charm. It will also control the Moonlite stepper motors and any other variant that has the robofocus pinout. You do not need another controller to do it.
In short I love this device, Well worth the dollars.
Mark