https://www.warhammer-community.com/wp-content/uploads/2022/04/KwezMUywLlb0D4xy.pdf
So this seemed to have been buried by the Dataslate. (and a lack of announcement, and the main
FAQ page being down temporarily yesterday).
Some things seem obvious (like fixing the stats on support weapon and Core for Harlequin troops.
The big thing that jumps at me is Dark eldar and Harlequins no longer kill Strands of Fate for Ynnari, but once per game blitz and rerolls over-riding Strands-manipulated dice might raise some eyebrows.