After HarborCenter is done, the Sabres will probably push to get a ASG here. The major sticking point is hotel/convention space for the league during ASG weekend, which hopefully will be solved by the HarborCenter. Assuming they make that push, another outdoor game is probably not in the immediate plans...
If Buffalo plays another outdoor game, I'd bet on them being the road team, though they would almost certainly have to be a playoff team. If the NHL are looking to put rivalries in these games, the Sabres would be hard to fit in given that any of our major rivals would probably prefer a game against a bigger rival for them (i.e. Toronto/Boston looking for an original 6 matchup, etc.)