if you preorder the game on gamestop youll get,
Ps2- Limited edition art book and bonus disc with playable demos of Kill.Switch and I-Ninja
gc - Limited edition art book
xbox - Limited edition art book
sample pics of the art book
https://www.gamestop.com/gs/sc2pop/sc2_book.jpg
https://www.gamestop.com/gs/sc2pop/ivy_1_s.jpg https://www.gamestop.com/gs/sc2pop/ivy_2_s.jpg
if you preorder at ebgames youll get a free t-shirt 
https://www.ebgames.com/ebx_assets/pr...es/233011x.jpg