So basically no additional story elements, dialogues or anything with alternative worldbuilding information like Han with the girl (Jenny?) in the cantina during the rough cut for ANH?
There are probably some alternate line deliveries, or different pieces of dialogue that suggest other things. Han saying “That bounty hunter we ran into on Ord Mantell changed my mind” was cut, which implies another adventure they had before ESB, for example.
It is likely however, that we generally know about just about everything that was cut, and that there aren’t any big subplots, sequences or scenes that have been cut out or kept under wraps.
People will debate forever still though that Luke missed the first time during their chasm swing, or Leia spat on Tarkin, or Vader’s TIE exploded, or the Biggs scenes were in there from the start. It’s fun to think about, but it’ll never be proven in anyway.“I love rumors! Facts can be so misleading, but rumors, true or false, are often revealing.” - Hans Landa
By the way, to come back to the speculated about additional AT-AT scene, is it known if a set for the compartment for the stormtroopers inside the walker was ever built for ESB?
Can’t remember ever reading anything about it, but if they built it, i’d guess they would have used it at least for some test sequences.
After Wedge downs the AT-AT with the tow cable that scene was expanded upon in story boards basically the rebel troops and the Storm Troopers were to have a small gun battle outside the downed AT-AT and the troops running out the trench shouting “Come on!” is still in the film but the rest is it is likely un-filmed or unfinished. They just blew it up it was easier.