Phi hosts Detroit, Denver, Las Vegas, Chicago and Rams outside their division. I said on other threads that I think the Rams are the safe bet, so long as they don't do anything odd like trade Stafford, then that would take them out of the running.
Detroit is the best matchup, but likely the NFL would prefer that game later in the season vs opening night which should do very good numbers. I think Chicago has a chance if the NFL believes that they will have improved their OL enough to give a decent matchup with Ben Johnson calling plays. The risk of picking a team with a weak OL is what we got in the SB vs KC as PHI will return a lot of their DL next season.
Wash is a candidate, but like Detroit, that game will do well later in the season in terms of numbers.