I'd say that's just 8092, Luke's Landspeeder. On topic, I for one think that this new AT-AT is a fine set, even if it cannot hold as many troops as I'd like. I also can't see why anyone would want an UCS AT-AT. I have this vision of the Millenium Falcon on stilts... Besides the fact it would be massively expensive.
EDIT: Damnit, ADHO15 beat me to it.