They announced the actors to play Harry, Ron, and Hermione and it raised a great many eyebrows. Playing Harry will be Jamie Parker (The History Boys, Valkyrie), playing Ron will be Paul Thornley (Les Miserables, Minions), and playing Hermione will be Noma Dumezweni (Doctor Who, A Raisin in the Sun). While Jamie's casting seems to have been accepted, some were miffed about Paul not being a natural redhead. But Noma's casting is the one that has people talking because for a rather obvious reason.
Image courtesy of Pottermore

Left to right: Jamie Parker, Noma Dumezweni, Paul Thornley
Clearly Noma's casting shocked folks. Rowling, though, calmed a lot of concerns when she replied to a Twitter post about the casting by clarifying something about Hermione:
Canon: brown eyes, frizzy hair and very clever. White skin was never specified. Rowling loves black Hermione
To be told in two parts, the play will premiere on July 30, 2016 at the Palace Theatre in London with at least four previews in May. The play is written by Jack Thorne (The Fades, This is England '86 and '88) working off of Rowling's story and directed by John Tiffany (Black Watch, Once).