Overwatch is a first-person-shooter made by Blizzard. The game has had an official reveal, but the public itself have not been able to try this out yet. If you're interested in a game. If you want to to try it out, you can sign up here. The game will have a closed beta at first. Later it does say to open up for the weekends so more people can try it out.
The set release date for the beta is October 27th. Currently the game is only set to be released on pc. If you want to check out some of the footage that has been released, you can check it out below.
There is no current release date for the game itself. Most likely the game will come out next year. This is the first first person shooter game that Blizzard is developing. The game is set to focus on online multiplayer.