The PSN version will get some exclusive content and features, but the only announced improvement at this time is the ability to join games in progress. Like the Xbox 360 and PC releases, the PSN version will have "numerous multiplayer maps, seven game types, four co-op missions and literally trillions of weapon combinations."
Three new trailers have also been released, which can be found below.
BOOM video 6849
BOOM video 6850
BOOM video 6851