Houston and Oklahoma City were the finalists in the last round of expansion who were not awarded franchises. Is it fair to assume they would likely court potential relocating teams? Plus, the league would have prior knowledge of those cities' plans, etc. Of course, this was 8-9 years ago.
Kansas City seems serious, and logical. Portland and Hamilton, too. Found a Bettman quote that said Hamilton's last expansion bid package didn't include an owner, main reason it didn't make finalists.
You've got to have political and corporate commitment, plus some sort of up front committment by potential PSL/ticket-holders.
Given all this, I don't think the league has as much say in relocation as expansion. Does this sound right? I mean, an individual owner might pursue suitors for his team that might not be on the NHL's list of target cities.