I have a background and setting already in progress, and could get something up and running if people might be interested. To see some of the ideas, you can visit a campaign site here.
In short, the hidden (liminal) world that exists alongside our own is threatened with exposure. Some who exist or know about this world say it is about time that they come into the open, others fear the change that might come about by such a revelation. What direction the campaign might take (stave off the revelation, survival in the world as it is, solving mysteries, or something else) will be entirely up to the characters.
So, I am interested to know if there are any possible takers for this before I put together a game here for it.