The IWF have published their new Constitution & Bylaws along with new Technical and Competition Rules & Regulations (TCRR).
There are three main changes:
New female bodyweight categories 90 and 90+
Removal of the bodyweight advantage
15/20 rule is now the 20/20 rule
http://www.iwf.net/2017/01/10/iwf-has-published-the-new-constitution-by-laws-as-well-as-the-technical-and-competition-rules-regulations-documents/