Kojima is being interviewed by Geoff Keighley later today, mainly about Metal Gear Solid but he's also said he's going to ask him about Silent Hill too now so hopefully we'll get some clarification. I myself have a PS4 so I can safely feel excited but I hope it's not exclusive because with the whole Tomb Raider thing I know how much it would annoy me (especially Silent Hill because it's my favourite video game series).
There are rumours though that the game is being co-developed with Sony Japan which means that the game would be exclusive. There wasn't a Sony Japan logo at the end with the Kojima Productions logo so I don't know how truthful this rumour is. I guess we'll have to wait and see.
I just need a PC Linux release so badly. Silent Hill is the greatest series and my personal favorite. I am trying to faze away from consoles as much as possible and stick with my gaming PC. There needs to be a PC Linux release
No one knows what platforms it will be on, other than the PS4. There hasn't been any official word on the subject at all. Given the amount of hype it's getting though, I highly doubt it will be exclusive to the PlayStation.