First and foremost, NFPA is in the book business. They need to keep those changes coming to sell a full array of new books every 3 years. I am not sure I really feel that much safer tho.
So far all I have seen on '17 is the PP Changes by Mike Holt. I have not looked at a lot yet.
Books will be ordered in a few months. NJ is not 'fast' in adopting the 'new' NEC, into the State UCC. Could be sometime in '18, then again, perhaps sooner.