I am interested in an update on this as well. I have at least 5 potential boating customers a week ask about the HD1 dome but I steer them away from it due to the management required for a system that supports SpeedFusion. This would include 2x HD1 domes, some sort of Balance or MAX router, three interfaces, etc. etc.
Boaters really hate running long cables to antennas, as do I from the install and signal loss perspective. The HD1 dome is a great alternative and it would be awesome to see a central router or device that could do the SIM injection and management of the dome device.