Easy, one thing almost everyone on this board has been asking for is new/more realistic looking running animations, and new animations over all. You can tell in that trailer that the running mechanics are still the same, still stiff and unrealistic, just with the new foot-planting feature added on top of crappy looking running. Plus their were some of the same old jukes from Madden 13 also. From this you can project that legacy issues/bugs will still be in the game because it all starts with the game-play engine, in which they are still using.