Updated with Cypher's Full Rules: + GW video and more.
Warhammer Community has a video and some rules up for Cypher... our favorite mysterious character
Updated with the rules page from Lady Atia
https://war-of-sigmar.herokuapp.com/bloggings/1775
via Warhammer Community
https://www.warhammer-community.com/2017/03/08/gathering-storm-cypher/