I was looking through old Star Wars comics to see what might be interesting, and the classic Empire Strikes back adaption includes some bonus concept art in the back.
I really love the AT-ST design that ended up in the movie, but this sleeker more rounded version looks neat too. It looks faster and more agile, to me it looks like a single seater instead of the AT-ST double seater.
There’s also some kind of sketch of an AT-AT walk cycle.
That’s exactly what that is. We can honestly thank Filoni and Favreau for bringing somewhat obscure Star Wars lore and concepts to the new canon.
In Andor they specifically mention the Rakatan Empire from before the Old Republic.