Rules are out for Custodes and Sisters of Silence on the official GW web page.
But are these 40K rules? That is quite interesting since neither unit appears in 40K fluff as being around at that point, only 30K fluff.
https://www.games-workshop.com/resources/PDF/Datasheets/Burning%20of%20Prospero%20Imperial%20Datasheets.pdf
