The following content was originally created in this thread on Reddit in /r/bloodbornethegame. All credit for the content of this post goes to /u/Iosefka, with only minor changes being made to reflect the difference in format.
Dreams of the Deceased
I will go further to suggest that there will be a mechanic in which the dreams will become darker similar to a world-tendency system, as I suggested in a previous post. However, I will add that I think there will be a "nightmare world" mode that represents the pure-black tendency from DeS in which certain things will only appear when in that specific tendency or mode.
Anyway, I have a few other ideas that are floating around that are still a bit muddled, but that's what is pretty solid so far. Discuss. Also, I have a new post on /r/bloodbornelore about medicine and the history of lycanthropy in case you're interested.