Sanity system

[TeleProd]

From the teaser site:

A sound of dragging feet? Or is your mind playing tricks on you?

This seems to implicate that there are some sanity issues. I sure hope so. I loved the sanity effects in Call of Cthulhu and Penumbra (although they were quite limited). There are many things to do with a sanity system other than visual effects and heavy breathing. For example, the sounds of enemies mentioned on the teaser site: you hear/see an enemy but can never be quite sure if they're real or not. Maybe things changing places when you're not looking, environmental changes, impaired movement/interaction etc.