'I saw it, It's ALIVE, it's huge" Why would a lion come out of the water? The statue of liberty went flying down the street. That shit came from the water.
Peep this site and read the history section. There's a dude in the trailer wearing a Slusho shirt, which seems to be part of the whole ARG. I'm banking on Cthulu.
http://www.slusho.jp