To me it would be the retired LEOs who would be in limbo. They would probably have to also go with the 7-round limit because (as I understand it), they were previously limited to the 10-round mags.
So now will Glock, Sig, Smith, etc... build special 7-round mags for just NY? I can't see that happening. Or is the reality going to be, you can use any mag you want, but can only load up to 7-rounds in it? (like the honor system?)