Blizzard sent out the following
Overwatch will be free to play from Thursday, July 26th at 11:00am PST through Monday, July 30th at 11:59pm PST for PC only. During this free weekend, we’re making Overwatch’s full roster of 28 heroes and 18 maps available for play in a variety of modes, including Quick Play, Custom Games, and the Arcade. Players will also be able to level up, earn loot boxes, and unlock a variety of different customization options. If players decide to purchase Overwatch after test driving the game, they’ll get to keep any progress made during the weekend—as long as they use the same Blizzard account that they played on.
To learn more please visit the Free Weekend Blog Post here: http://playoverwatch.com/en-us/news/21963964
Will you be playing the game at this time?