https://www.gamespot.com/articles/overwatch-has-a-free-weekend-coming-up-on-pc-letti/1100-6460546/

You might have heard this one before, but guess what: Overwatch is getting another free play weekend for anyone who hasn't purchased the game on PC. Between July 26-30, anyone with a Blizzard account will be able to download and play Overwatch on PC for free. PS4 and Xbox One owners are left out this time, but judging by the company's history, you'll probably get another free trial before too long.

The free version will come with 18 maps and all 28 heroes, including the newcomer Wrecking Ball. Modes like Quick Play, Custom Games, and Arcade will be available. As you participate in matches, you can level up and unlock loot boxes that contain things like new costumes, voice lines, sprays, and emotes for the heroes. If you buy Overwatch after playing the trial, your progress will carry through to the full game, provided you use the same Blizzard account.