One of the most jaw-dropping shots of the first trailer for Rogue One: A Star Wars Story was a group of Imperial walkers storming a beach. They obviously weren't the same as the AT-ATs from The Empire Strikes Back, but what were they? Now we know. The latest episode of The Star Wars Show (embedded below) revealed the walkers are called AT-ACTs, which stands for "All Terrain Armoured Cargo Transport".
The show also confirmed the black troopers in the trailer are Death Troopers, and revealed the Shore Trooper, which looks like this.
Those reveals came from the key art for Star Wars Celebration Europe, which takes place in July, which you can see here.
Here's the full episode, which starts with a nice scene from the set of Episode VIII.