E3 2010: Shogun 2: Total War



"Assaulting castles seems like it'll be more interesting in Shogun since Creative Assembly is making the structures more complicated. Instead of simply busting down an outer wall to infiltrate an area, there'll be a network of passageways inside the outer walls. In all there'll be three different castle types – those on land, on a coast, and near a mountain. There'll be five upgrade levels to each, so expect 15 total castle type configurations to make things varied. " - IGN

See more here- http://uk.pc.ign.com/articles/109/1099535p1.html