The Japanese PlayStation.com site was updated recently with a mysterious new game detail page.
The page shows a countdown atop a red-colored puddle, with a looping track of static and the panicked English voices of a man and woman as background sound. To the right of the page is half of what appears to be the Japanese alphabetic character for the sound "Sa."
Given the general creepiness of the page, there's some speculation that this is a teaser for a new game from the team that made Siren, one of last gen's spookiest franchises.
The countdown is at 45 hours as of this writing, so details will presumably be announced on Friday.