I don't know if this is a bug as much as it is an oversight, but when I have been in a party and we've teleported together to one of the instanced zones, we've always found ourselves in different instances. It seems like the only way to resolve this is to teleport away and back again until we end up in the same instance.

I think it's awesome that we have instanced zones to help with the launch congestion, but it's pretty bad that the game doesn't think to try and keep parties together in the instance with the least amount of people.

Don't know how long we will have instances, but I'm hoping this will be fixed before they go away.