According to Pierre LeBrun, the NHL have brought up the idea of reducing the preseason to a maximum of four games. They would make up for lost revenue by adding two more regular season games, for a season total of 84 games.
Another reason expanding the regular season makes sense is due to NHL expansion. The league has added two new teams with Vegas and Seattle, and because the NHL wants each team to visit each other, the limit of 82 games takes away from repeated rivalry matchups. The Oilers and Flames will only play each other three times this year, much less than previous years.