Hi PlayStation gamers,
If you haven’t had a chance to join the fight for the future in Overwatch, we’re excited to give you another shot — completely free! Assemble your friends and try out Blizzard’s team-based shooter during the Overwatch Free Weekend September 9-12 on PlayStation 4!
The Overwatch Free Weekend will begin on September 9 at 11:00am Pacific, and all PlayStation 4 players will be able to download the game and play free during this period — no sign-up or code required. After you’ve escorted some payloads, captured some points, and scored a few Plays of the Game, the Free Weekend will conclude on Monday, September 12 at 4:00 p.m. PDT.
I guess it's for XBO as well.