As of right now, the Jets host the Giants next Saturday in NJ at 1:00 EST.
The Cowboys host the Eagles at 4:15 EST.
If the Giants beat the Jets at 1, the Cowboys-Eagles game is 100% meaningless to both teams. First of all, the Eagles would be eliminated from playoff contention right then and there, but also, a Giants win will put them at 8-7, equaling the Cowboys’ win total. Regardless of whether the Cowboys beat the Eagles, they would still need to beat the Giants Week 17 to win the division, as a Giants win over Dallas would give the Giants a 2-0 head-to-head advantage over Dallas, and thus the first tiebreaker. I highly doubt FOX wants to televise a game in which the Cowboys sit Tony Romo, DeMarcus Ware, Dez Bryant, Miles Austin, and Jason Witten.
If you’re a fan of the Cowboys, Eagles, or Giants, you might want to start figuring your TV situation, and set up two TVs side-by-side for Christmas Eve. It could be a pretty awesome/nerve-wracking 3 hours of football.
UPDATE: Whoops. According to the506.com, no games at all can be flexed on Christmas weekend. Not from 1:00 to the NBC slot, not from 1 to 4, not from 4 to 1. No changes can be made at all, as the NFL apparently didn’t want to mess with fans’ holiday plans. So if the Giants win, you may as well enjoy some time with your family, because Cowboys-Eagles will be completely meaningless.