Take-Two has just released a teaser website for Bioshock 2: Sea or Dreams and are going around town putting up weird posters on the streets to advertise the website, which can be found here.
Picture provided by Kotaku reader Dominique:
Though the site is new, there isn't much too see on there. You can see a picture of the big daddy doll that was shown in the first teaser trailer of the game, a picture of an "average mens shoe" on the beach and local newspaper articles such as one from February 20th, 1967 titled "LOCAL GIRL VANISHES IN MYSTERIOUS ATTACK" which should give some kind of hint about what to expect in the upcoming game.
Still more updates to come. Hopefully we'll get an insight of what to expect in the game or maybe some actual gameplay soon.Official Website