I've always liked the AT-ST scene in TESB - it ads a sense of realism and variety, plus some dynamics, which the AT-AT lacks. As Bingowings said, there's no need for each movie to introduce new vehicles. The Prequels were a total mess in that respect and far worse than the established, but expanding set of craft and vehicles in the Originals.

I'm not going to argue about it, but I hope the scene remains. It's a scout vehicle; otherwise the AT-ATs become a uniform bunch that's a bit dull even by the Empire's standards. ;)

By the way, is the AT-ST model different in TESB? It always seemed more smooth and elegant than the "boxes" on Endor... :/