I predict the Prism Staff will come out in the same update that introduces 120 crafting skill, and crafting it will be pretty similar to crafting the abjuration stuff from Legion at present date and time.
Things will play out much like a story told by Franz Kafka, only standing in for the evil and indifference of man in an absurd society there will be multiple materials dropped by a singular Voidexhibitionist each, a single digit High-Quality production rate, and a Normal Quality version so worthless that nobody will take it even if you stab him or her with that thing and run away.