I serendipitously discovered a forum website for Michael Bay, the Executive Producer of Transformers and Producer of Pear Harbour, amongst others.
It has a Film-Making and Movie Discussion forum. What I’ve so far skimmed through suggests its more for film fans than film makers, but it does give production news/snippets/oddments and draws attention to trailers and makings-of movies, so who knows, maybe there’s more to be found in there.