As Blizzard previously announced, today begins closed beta testing for Overwatch, their upcoming multiplayer first-person shooter. The Overwatch Twitter account has a few additional notes about this. This tweet says there isn't an exact launch time for the beta (though after the current maintenance ends is a good guess) and this tweet explains that once the beta is live, they will begin flagging accounts to participate "in waves," which may take hours to complete. Finally, this tweet notes that there are no "keys" for the beta, warning to watch out for scams offering them. A note later added to the original announcement says this will be available in the EU as well as North America.