I believe it was just a way to try and promote ticket sales at both sites. Canada is guaranteed to play in Montreal for entire knockout stage and they wanted to make sure they could sell decent amounts of ticket packages there. It says right on the website that Canada, if in the knockout stage will be playing the 8pm game in Montreal. It'd really make a great day to see the US as well, but regardless, all eight teams that make the knockout stage should put on a good show. Love this tournament more and more every year.
To think Finland could go from winning the gold to the relegation round in one year is astounding. That and Canada getting knocked out in the quarterfinals as well last year. This tournament has really upped the ante in parity lately. It's great for the tournament and the game.