I didn't see this thread before posting a new one "Dambusters MK2", but according to the news in Wellington, and it's on the front page this morning, Hollywood isn't mentioned, and Mel won't be in it! It looks very much as though Hollywood, and American, involvement will be minimal, and besides, Peter Jackson is a stickler for accuracy. Most, if not all of the previous posts are therefore irrelevent!
http://www.stuff.co.nz/stuff/0,2106,3782818a10,00.html