I think the GK update is going to cause problems... here's the passage:
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1. Procedure
• The ball must be stationary and is kicked from any point within the goal area by a player of the defending team
• The ball is in play when it is kicked and clearly moves
• Opponents must be outside the penalty area until the ball is in play
2. Offences and sanctions
If, after the ball is in play, the kicker touches the ball again before it has touched another player, an indirect free kick is awarded; if the kicker commits a handball offence:
• a direct free kick is awarded
• a penalty kick is awarded if the offence occurred inside the kicker’s penalty area, unless the kicker was the goalkeeper, in which case an indirect free kick is awarded
If, when a goal kick is taken, any opponents are inside the penalty area because they did not have time to leave, the referee allows play to continue. If an opponent who is in the penalty area when the goal kick is taken, or enters the penalty area before the ball is in play, touches or challenges for the ball before it is in play, the goal kick is retaken.
If a player enters the penalty area before the ball is in play and fouls or is fouled by an opponent, the goal kick is retaken and the offender may be cautioned or sent off, depending on the offence. For any other offence, the kick is retaken.
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Issue I think:
"...because they did not have time to leave" is vague.
This law change is designed to help teams play out from the back. It's the Pep law. Surely all teams facing City will have players lurk and slowly leave the box. I think it will be hard to manage.