You can click to embiggen both of these images. Simply preordering the game nets you the limited edition, which comes with a bit of DLC offering "a series of missions to uncover what happened between the devastating events of inFamous 2 and inFamous: Second Son," which unlocks Cole's signature yellow jacket from the first game (he didn't wear it in the muggy bayous of inFamous 2).
Which... I actually find pretty appealing, for some reason - though I do really like Delsin's design.
If you're interested in throwing down an extra twenty bucks, you'll get the DLC, Delsin's beanie and some buttons! Also a patch, some vinyl decals and an exlcusive "Legendary" in-game vest, which is just the weird hand-print with the Space Needle they've slapped on the CE's cover art.
Are some buttons and a beanie worth twenty bucks, to me? You bet your ass.