As with any rumor, this information should not be taken as fact.
Walmart Canada has dropped a huge leak today, adding a bunch of unannounced titles games up for pre-order. As of publishing, all games can still be seen on the Walmart website.
You can see the full list of supposedly leaked games below. Same goes for Ubisoft's presentation and Splinter Cell, which many people are hoping is revealed in full. We're due for a new Gears reveal. Borderlands 3 is a game everyone wants. It's an exciting time to be a gamer. But Walmart Canada (spotted by Wario64) has posted pages for Rage 2, LEGO DC Villains and Borderlands 3 as well. Of course it's time for a new Forza Horizon - it's an even-numbered year, after all. Firstly, there are multiple spelling errors like Assassins Creed (not possessive) and Forza Horizons (it's Horizon). It looks like id Software might have picked back up on the project.
Assassin's Creed (XO/PS4) Current rumours point to a new Assassin's Creed being out next year, that will be a spin-off from Origins that includes Ancient Greece.
So yes, it's a very amusing, self-aware response to Walmart's slip-up, but it also appears to be a tacit confirmation that the leak itself is real. And "Rage's" last Tweet was sent Wednesday, reacting to a possible leak that a sequel is coming. In most cases, premature postings are the result of a retailer preparing for potential announcements before events like E3, a major annual gaming conference scheduled for June. It's impossible to verify any of this, but leaked retail listings have outed games long before they were officially announced - Shadow of War immediately springs to mind.