Micechat have put up a really detailed explanation of what to expect from Disneylands Star Wars Land. It's a long article but worth the read and even if only half of it ends up as reality it's going to be pretty amazing and well worth a visit.
The final layout of the land has a northern and western perimeter walled off from the outside world by massive show buildings over 150 feet tall that will push right up against the existing toll lanes and tram route that parallels Disneyland Drive. Built to look like sheer rock cliffs and forested mountains from inside the land, the show buildings will be partially sunk into the ground yet still tower overhead
Source: http://micechat.com/118668-disneyland-phantom-menace/While the perimeter structures of the Star Wars land are huge and elaborately themed, they will be nearly impossible to see from anywhere else in the park as they’ll be obscured by a tree-lined berm built just north of the new Rivers of America route, along with the existing forested hills east of Fantasyland and north of Critter Country.