New Overwatch hero Orisa will be released onto the live servers next Tuesday 21st March. The deployment follows an unusually long period of testing on the PTR.
Orisa is a bit of a mish-mash of existing tanks, with deployable shields and an alternative fire with a similar theme to Zarya's Graviton Surge. The developers hope she'll provide the game with another “anchor tank” though, similar to the role that Reinhardt plays.
You can get a little insight into how Blizzard went about designing Orisa in the developer video featured above. She's still available to test out on the PTR (at the time of publishing at least), and so you might want to have a mess around with her before she hits the live game.