In addition to the PS3 exclusive content, there's also the wacky Soul Snake Sword, and extra campaigns starring Sam and Blade Wolf.
For those of you who are curious, Konami has just put up a trailer showing off the new VR Missions and the Soul Snake Sword. It's in Japanese, but apparently Snake's voice is context sensitive, which should make for some awesome Easter egg style experimentation.
Here's a half hour of the Arkham Origins Mr. Freeze DLC, if you want to watch that
11:45 AM on 04.15.2014