Battle.net has a confirmation of the May 24th release date for Overwatch that was accidentally leaked today, confirming that preorder customers will get first access to the beta on May 3-4, and adding that there will be a free open beta for everyone from May 5-9. A new developer update video covers the open beta, explaining why they will go this route, and there is also an open beta FAQ included in the announcement. Here's word from a separate press release:

Assemble your team and prepare your defenses—the fight for the future is about to begin! Blizzard Entertainment today announced that Overwatch™ will arrive in stores on Windows® PC, PlayStation®4 computer entertainment system, and Xbox One starting May 24.†† Heroes from around the world can join the coming conflict by pre-purchasing Blizzard’s team-based first-person shooter today at www.playoverwatch.com/buy .

In addition to receiving the previously revealed Noire skin for Widowmaker, Overwatch’ s ice-cold assassin, players who preorder or pre-purchase the game for PC, PS4™ system, or Xbox One will also get a two-day head start on the upcoming Overwatch open beta for themselves and a friend.† In the open beta, players will have an opportunity to play all 21 heroes and experience the intense action, tactical depth, and vibrant world of Overwatch prior to the game’s release. Following the head-start period on May 3–4 for those who have preordered, gamers everywhere will be able to assemble a team of friends and check out the game free during the all-access period from May 5–9. To learn more about the open beta, players can visit the official website.

“Overwatch is a team shooter for everyone, with deep, cooperative gameplay, fast and fun competitive action, and a diverse range of larger-than-life heroes,” said Mike Morhaime, CEO and cofounder of Blizzard Entertainment. “We think PC and console players everywhere will have a great time in the game, and we’re excited to give everyone a chance to try Overwatch out for themselves ahead of its May 24 launch.”