As for the four mazes, I have heard that Crowe is going, TOTT remains the same, and Sub-Species has only one ending, is shorter, and contained entirely within the ruins.
The other two mazes remain a mystery. One is with the only clue being "beauty is only skin deep" (i did a trawl through Google on this, and found no significant third party IP potentials except for Saw, which is unlikely), and another maze. I have heard the name "Unmasked" being used with reference to Scarefest amongst enthusiasts.