Usually, when a leak comes out, we typically say to take it with a grain of salt. While that still holds true, as far as leaks go, this one looks pretty safe. It appears as though Assassin's Creed: Origins is Game Informer's cover story for their next issue, and that it will release on October 27th, 2017. Leaks have popped up on Reddit with a set of cover images as well as the entire feature article posted to Imgur.
It seems pretty legit as the image above matches the leaked pre-order card for the game's Gold Edition that confirmed the Egypt setting.
Suffice it to say; there are a ton of potential spoilers in the feature article and on Reddit, so if you're waiting for the inevitable Ubisoft E3 reveal, you might want to hold off on seeing them. That said, the time that Ubisoft has taken to produce this game appears to have paid off as there is a level of depth here that the series has never seen before.
Ubisoft's E3 presser is going down on Monday, June 12th at 10 AM PST/1 PM EST, so keep it locked to GameZone for more details on Assassin's Creed: Origins.