IF the season opens on the 19th, then it would be a matinee game IIRC given that Staples isn't available in the evening. Given that NBC/SN wanted to nationally televise the banner-raising game, and assuming that CBC will have wall to wall HNIC coverage that day as well and would likely pick that game up if a Canadian team was playing, I think Vancouver is a very good possibility.
That's a lot of "if's" though
. That assumes NBCSN would do a Saturday day game (doubleheader?) and that they'd still be interested in televising it if it was vs. Vancouver instead of another US team.