Three things to know about next Sunday's San Francisco 49ers-Seattle Seahawks NFC Championship Game at CenturyLink Field:1. Inevitable meeting: The matchup has been brewing since the offseason. This is one of the most heated rivalries in the NFL. The players have gotten chippy. The coaches have gotten chippy. The teams have poached each other's rosters. It only makes sense a Super Bowl berth comes down to these two NFC West adversaries.2.