Depends on who the 3rd seed is. I just assume that the South winner will be the 4th seed, so if we're 5th, we play them by default. It's all conjecture at this point though.
But as a rule, the lowest seeded team available plays the highest so for WC its 3v6 and 4v5.
NE not getting the bye would be huge for everyone not wanting them to be in the superbowl (so everyone minus some #######s that live in Massachusetts).