Smarter Zone Coverage
In Madden 16 Zone coverage did not react specifically to the play. EA explains, "our zone assignments didn’t work together and therefore had no concept of a global scheme." There were also only three zone coverage assignments.
That's changing with Madden 17 with smarter zone coverage that gains better AI from the Behavior Controller and the addition of new zone coverage types.
After talking to NFL coaches and players, EA re-wrote the Madden 17 zone coverage from scratch to deliver 10 new zone assignments and smarter logic in place that will help deliver better overall play.
Check out this description of the 10 new Zone coverage options for more on how this works.