Potential Super Bowl preview highlights Week 15 By JOHN KRYK, QMI Agency

New England Patriots head coach Bill Belichick and San Francisco 49ers head coach Jim Harbaugh (REUTERS/Mike Segar/Robert Galbraith)

And then there's Lions at Cards ...

At the other end of the importance spectrum is Sunday’s game in Glendale, Ariz.

The 4-9 Detroit Lions have lost five in a row; the 4-9 Arizona Cardinals, nine in a row.