This is going to be extremely poorly adjudicated by the umpires. It's going to be an inconsistent farce.
I don't even blame the umpires. It must be tough to develop instinct for the constantly changing rules/interpretations.
Players lower their centre of gravity to change direction, it's simply the body's mechanics. Changing direction occurs frequently in congestion. The line is going to be extremely thin between legal and illegal.
Like the below photo - I have no doubt that a player will move this way in congestion and there will be instances where an arm slips over his shoulder and they won't get a free (when they should).
The AFL are setting the umpires up for a roasting.