Rules 15 & 16 remain unchanged.
Rule 17 will change: 17.1 is now just 17 and 17.2 is deleted:
17 ON THE SAME TACK; PROPER COURSE
17.1 If a boat clear astern becomes overlapped within two of her hull lengths to leeward of a boat on the same tack, she shall not sail above her proper course while they remain on the same tack and overlapped within that distance, unless in doing so she promptly sails astern of the other boat. This rule does not apply if the overlap begins while the windward boat is required by rule 13 to keep clear. 17.2 Except on a beat to windward, while a boat is less than two of her hull lengths from a leeward boat or a boat clear astern steering a course to leeward of her, she shall not sail below her proper course unless she gybes.
Rule 17.2 has been always a very difficult rule and hardly ever used. The fact that a windward boat will try to cover a leeward boat is used in close sailing like team- or match racing and a legitimate 'tactical' way to stop or slow down an opponent. The leeward boat has enough 'power' as a row boat to assert itself on the game.
On a personal note: You might have noticed a lack of daily new post lately. This is due to some personal circumstances in my family beyond my control which take a lot of time. Please bear with me. I'll try to get back to more involvement asap, but it might take a while.
I'll try to get to answering all the comments which have been left as well, for which I'm grateful, but don't have time to answer individually at the moment. I'm sorry about that. Please be patient.