Bioshock 2: Sea of Dreams

I am personally buzzing with excitement over Bioshock 2, after the enormous success of the first.
It was, and still is, one of the best games ive played and despite it scaring me shitless at some points i found it hilarious, invigorating and downright fantastic and addictive.
the key thing here with Sea of Dreams is that it could be either a Pre-quel or a sequel to the first, and the trailer certainly gives some clues to that.
The small girl on the beach (possibly a Little Sister) and the city rising out of the sea made me think that this would be a sequel, but hearing some inside info i am to understand it could be either!
I can't wait! This should definatly be a contender for game of the year and is apprently being converted to PS3 format aswell.