Blizzard was speaking and, as announced in the press about closing of the first beta, is about to start a second one.
The shooter Overwatch will be testable again from May 2 for PC, PS4 and Xbox One (between May 2 and May 3) only to those who have access to the Early Access. Recall that to get early access it is necessary to book the game by 29 April.
For those who do not want to book it, or should purchase it later, they will have access to an open beta beginning on May 5th at 4 PM PDt. As for the duration, all the beta will end up at the same day: May 9th at 10 AM PDT.
For the PC version you need this Battle.net software and a free Battle.net account, which you can create through this website. Start Battle.net software and then click on the left side on the Overwatch icon to begin the installation process.
On the consoles of PS4 and Xbox One beta client is available from the respective stores. Just visit the Store from your console and type the keyword “Overwatch”. In the search results you can then choose “Overwatch: Open Beta”.
Remember that Overwatch is going to release for PlayStation 4, Xbox One and PC on May 24th.