The weekend technically starts September 9 at 2PM ET. Anyone with a PS4 or Xbox One will be able to download and play the 15GB game for free, no login required. You'll have access to all 22 playable characters and a variety of game styles, be able to level up, grab loot and troll your opponents. If you want to keep the spoils of your online battles once the weekend concludes at 7PM ET on the 12th, you'll need to pick up a copy of Overwatch: Origins Edition.