Halloween vs. Hellraiser: According to a recent report over at Creature Corner, during a Q & A at Texas University last week, 'Pinhead' himself (Doug Bradley), spoke about Dimension Films' seriousness about taking the proposed match-up on:

Bradley does say that Dimension are in the planning stages for Halloween VS. Hellraiser film, and want to try and have it out by next Halloween.
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Brian B. at Movieweb
Brian B.