An infographic is also available to illustrate how the new Local Rule should be used. If a Committee wishes to introduce this Local Rule, the following wording is recommended:
When a player’s ball lies on the putting green, there is no penalty if the ball or ball-marker is accidentally moved by the player, his partner, his opponent, or any of their caddies or equipment.
The moved ball or ball-marker must be replaced as provided in Rules 18-2, 18-3 and 20-1.
This Local Rule applies only when the player’s ball or ball-marker lies on the putting green and any movement is accidental.
Note: If it is determined that a player’s ball on the putting green was moved as a result of wind, water or some other natural cause such as the effects of gravity, the ball must be played as it lies from its new location. A ball-marker moved in such circumstances is replaced."
Also note this question and response in the Q&A regarding 2017....
As part of the Rules Modernisation initiative being pursued by The R&A and USGA, we plan to preview a comprehensive set of proposed changes in 2017. Given the significant ongoing issues that have arisen with the application of Rule 18-2 over the last several years, we concluded that this particular change should be available to all committees now, through the adoption of a Local Rule.