The World Flying Disc Federation has announced a new set of Rules of Ultimate and the Rules Appendix 2017. The new rules came into effect on January 1, 2017.
Please find the 2017 versions of the rules, the track changes versions and a summary of changes here: http://wfdf.org/news-media/news/press/2-official-communication/796-wfdf-announces-new-set-of-rules-of-ultimate-and-rules-appendix-2017.