Thanks to Evander from NeoGAF, we have some details regarding the popular Kratos sackboy costume for LittleBigPlanet. First of all, the card is given to you immediately when you preorder in-store.
According the GameStop Web site, if you preordered online or you arranged for in-store pickup, your code will be e-mailed to you one week before the game ships. The code must also be redeemed by January 8th, 2009.
Lastly, like PSN games, each code will be associated with a PSN account -- which "allows download of the LittleBigPlanet in-game costume on 5 PS3 systems per account." Too bad you don't get five pouches to share with your friends, huh? To quote:
"Upon receiving your game, follow these instructions closely to download your new costume:
1. Open an account on the PLAYSTATION Network (or use an existing account) on your PS3.
2. From the PLAYSTATION Network icon on the Xross Media Bar, select 'Account Management'.
3. Enter 'Transaction Management'.
4. Select 'Redeem PLAYSTATION Network Card or Promotion Code'.
5. Enter promotion code. Please note that the promotion code is case sensitive and must be entered exactly as displayed.
Once the promtional code has been entered correctly click continue. Once you accept the terms you will be taken to the download screen." More PlayStation 3 News...