There are new leaked images showing off Harlequin Psychic powers and Enigmas of the Black Library (relics). The Psychic powers show off the new primaris power, Veil of Tears and its good to see some of these powers in the new codex.
There are some really interesting items and powers listed here. I think looking ahead at bringing Harlequins in with my Dark Eldar or Eldar armies looks very promising.
Here is a link to the latest leaked images for Harlequins