On the same day that tickets went on sale for Star Wars Celebration in Orlando next year, Disney has released the official artwork for Star Wars Celebration in London this July.
The art reveals the AT-ATs seen in the Rogue One teaser, but StarWars.com confirms they are a new class of the walkers. These are the AT-ACT, or All Terrain Armored Cargo Transport. That would explain the different paneling on the side that people noticed in the teaser trailer.
Characters from The Force Awakens are also included, but all other Star Wars references are missing. This makes it a piece of official art showing the first of the “Disney” Star Wars films.