So im surprised no one else noticed this yet but... i was just watching IGN's live ps3 coverage.. at the beginning of the presentation they were showing a montage of ps3 games and wouldn't you know it?!... mortal kombat showed up! with it cam Kung lao slicing reptile in half while he was standing exposing his green organs... which looked absolutely amazing i might add!
Seeing as this fatality is completely different from the one shown in the trailer then i guess its safe to say there will be multiple fatalities (2 at least)