Blizzard has announced that Overwatch will have a free weekend on September 22 through September 25 on all platforms.
During a free weekend, players have access to the entire game with more or less no limitations during the time period. So people still on the fence can try out the different modes and new characters for the game or see if it has changed more to your liking since the initial release.
The last free weekend for Overwatch was in May, so they do not come often. If you’re interested in trying the game out, this is a good opportunity to do so.