I don't think they are going to do anything about that. There are a bunch of discussions about how Dead Space 3 will work, with some facing problems while joining co-op, some having strict NAT issues, and others unable to play with family members using the same network. People have also tried Hamachi and Radmin VPN. Even on Steam, you will find many discussion threads pointing out these kinds of issues. I don't think they will ever fix those things by themselves. All we have to do is figure out which one is working and then tell or write it here.