Let’s be honest here, although some people say so here, if it is Kojima and we get Silent Hills no one will be really pissed or angry at Kojima (well perhaps some XBOX fans, but they would be pissed either way).
The thing for me is, there is so much unknown stuff / inexplainable things (go the extra mile to make an app, get it on the store, Sony not interfering…) that it has to be more than just some indie.
So why Kojima:
1. The name, that’s an 1:350 chance of a coincidence already.
2. If Cory or some other developer behind it, why would they use all these Kojima references (the guy with the eye patch, Setting a small island (=Kojima) as a profile picture).
3. Which other developer is famous for such things.
4. The rumor was that besides Blooper another prominent Japanese developer is working on a Silent Hill project. This also means that it is not Cory.