Wait, what? The ref expressly explained yesterday that if the team that possessed the ball first (turned out to be the Giants) scored a field goal on the first possession, the game would not end and the other team would get to possess the ball. The game ends on the first possession only if the offense scores a touchdown, there is a turnover leading to a defensive score, or there is a safety. That applies both to the regular season and the playoffs. Are you talking about some other rule change?