I've been peeling this teaser as well as the P.T demo since the news broke, and I came up with some conclusions and theories.
I might be completely wrong, but there are multiple hints that point toward a few specific directions.
"The only me is me, are you sure the only you is you?"
This right there, points to multiple versions of "you" or the player, along with the "infinite" loops of the hallway which seems to point in the direction of multiple universes.
I know they said the teaser had nothing to do with the main title, but I am still intrigued at another thing that points in the same direction, that being the game's new title.
"Silent Hills" plural.
Taking into account that there are "multiple yous" and according to the title, multiple Silent Hills, is it too far stretched to think that this new game will bring in some sort of multiplayer component?
The game could remain single player/story oriented and incorporate other players in the story mode "a la Dark Souls", it's a wild theory but I do think the signs are here.
Another theory would be a little less (or more) far stretched, and would have to do with siamese twins.
The very first image you see when the P.T game starts, is a "cockroach".
Or more precisely, 2 cockroaches "tied together" back to back. Makes you wonder how screwed up the story is going to get, but knowing Silent Hill's track record, and Kojima's/Del Toro's, we can expect some shocking stuff.
Anyone has thoughts on those aspects?