Play-Asia has revealed images comparing the new game cases for the PS Vita to game cases we already have. The images show the PS Vita game cases compared to the PS3, Xbox 360, Nintendo DS, and PSP game cases.
According to the images below it appears as if the PS Vita cases will be slimmer and smaller, likely thanks to Sony removing the game manuals.
As you can see, the PS Vita game cases are considerably smaller than current cases. Given that the PS Vita is portable, it only makes sense to have the game cases equally as portable.