He is one of five players with the highest probability to make the cover which is scheduled to be announced tomorrow.
Unlike the previous five editions, this year's Madden NFL cover will not be determined by a fan vote. Hence there is speculation that it might be because they want a player that would not win a popular vote. I think that might indicate Cam Newton but also someone like Peyton Manning or a defensive player light Von Miller.
Honestly I don't know how they don't put Newton on this year's Madden NFL cover.