The demo reveals some very interesting things about the game.
If you would rather go into Resident Evil 7 entirely blind, and have the element of surprise preserved, then I advise you to hit the back button on your browser window right now. While this news post will have no story spoilers for the game, it will be discussing details of extra modes that will be unlocked once you finish the game.
It seems like, much in the vein of classic Resident Evil games, clearing Resident Evil 7 will lead to you unlocking additional difficulties and modes- something that should keep players returning to the game long after they are done with it otherwise.
You can check out the list of the modes unlocked upon clearing the game below. Resident Evil 7 will launch on PS4, Xbox One, and PC on January 24, 2017.
Cleared Casual or Normal
Unlocked Destroy Mr EveryWhere
Unlocked Time Attack
[NeoGAF Source Has Unmarked Spoilers]