Raze from Larian posted on the other thread discussing this
http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=572659#Post572659

And emailed me back
"Larian is looking into this, along with the publisher, but there is not much we can do directly. Microsoft has an API for multiplayer on XBoxOne than handles the network connections."

Not sure what that means, but hopefully it means there will be an answer soon.