Depends. If it's like the ToS artbook, then it's definitely worth it (and could be potentially rare). My EB got a total of 2 ToS artbooks, one of which the manager held for me since he knows me. I'm actually pondering preordering S4 because of the artbook....hrmmm....
EDIT: and 4 does away w/ the Trinity Site system & paired combat, the 2 worst things about 3 imo. Not saying that guarantees greatness, but it certainly helps.