If you pre-order Dragon's Crown from "participating stores" (most likely the ones listed on the pre-order page, such as Amazon, GameStop, etc.), you'll get a free 64-page artbook:
The book includes illustrations of the characters, environments, and commissions from artists Akira Yasuda (Darkstalkers, Marvel vs. Capcom), Kinu Nishimura (Code of Princess, Virtue’s Last Reward), and Gouda Cheese AKA BENGUS (Super Street Fighter II, Darkstalkers).
The game will be available August 10th. Important thing to note is that you can only play online with people who have it for the same system you do, so you can't go online with your Vita to play with PS3 owners & vice versa. However, you can still transfer your saves if you own both versions of the game.