Nothing. I think it's partly due to the fact that it's not a Lionsgate UK release, so Lionsgate US may own the rights to the (admittedly minimal) extras which adorned the US disc (Region A, AFAIK).I'm really looking forward to this. Had no idea about it until I spotted the thread in the main movie section.
Are there really no extras though? No making of, deleted scenes etc? Would have been interested in learning some more about Zack Gottsagen.