PS4 Link
Note: To download the game on PS4 you must select 'Try Free Demo'.
Xbox One Link (Requires Xbox Live Gold Membership)
Good for those who are contemplating on buying this but need to try before they buy. Starts next Saturday at 4am. Download size for the PS4 is 9GB and for the XB1 15GB. Enjoy.
If you haven't had a chance to join the fight for the future yet on PlayStation 4 or Xbox One, then get ready for the perfect tactical opportunity. Assemble your friends and try out Blizzard’s team-based shooter during the Overwatch Free Weekend September 9–12!
For this free weekend, we're making Overwatch's full roster of 22 heroes and 13 maps available for play in a variety of modes, including Quick Play, Custom Games, and the latest Weekly Brawl. You'll also be able to level up, earn Loot Boxes, and unlock different customization options via the Hero Gallery. If you like what you see and decide to buy Overwatch: Origins Edition, you'll also get to keep whatever progress you made during the weekend. (Wicked!)
Installation and Play Instructions:
Before your watch can begin, you'll first need to install Overwatch on your chosen platform. Every platform is a little different—to install and play on September 10, please follow the instructions below.
FOR PLAYSTATION 4:
Step 1: Turn on your PlayStation 4 and log in to your preferred local user.
Step 2: Go to PlayStation Store and select "Search" from the top menu.
Step 3: In the search field, type in "Overwatch."
Step 4: Select "Overwatch Free Weekend" from the search results and then click "Download."
Step 5: Once the download and installation process is complete, click "Start" to begin!
FOR XBOX ONE:
Step 1: Turn on your Xbox One and log in to your Xbox Live account.
Step 2: Go to the Xbox One Store, then select "Search."
Step 3: In the search field, type in "Overwatch."
Step 4: Select "Overwatch: Origins Edition Free Weekend" from the search results and then click "Free Trial."
Step 5: Once the download and installation process is complete, click "Launch" to begin!
Credit to HUKD for the find.
Highly recommended for anyone who hasn't tried it!