The Conferences have been even at 15 teams apiece in the decade since the last wave of expansions ended. They were usually imbalanced during the expansion period, though. It wouldn't be all that surprising if the Northwest Division had 6 teams and the Southeast had 4.Would someone from the West move over to the Eastern Conference to make up for it? Or are the conferences already imbalanced anyway?
Many fans seem to think that Detroit has a deal with the NHL to move into the East at the first opportunity. I don't know if that's actually true.
Personally, I'd go with:
Thrashers --> Northwest
Wild --> Central
Predators --> Southeast