Usually they tag 'movie' or 'the ----- movie' onto new movie names for the website, so they can get around the expense of paying high prices for premium domains (that's assuming the movie contains such a word, like 'Stardust', 'Hairspray', 'Underdog', etc which are all out currently as movies). So these become 'thestardustmovie.com' or 'underdogthemovie.com', something like that.
However, when the name is obviously a completely made up word or phrase, like yours, and it's obvious that it was grabbed entirely with the intention of profiting from their IP (Intellectual Property), there is no contest... they can grab this name from you easily, you simply have no standing if they wish to take it.
Since it's kind of the tag, the byline of the movie, rather than the movie name proper, it's in more grey area as to whether they'd grab it. No grey area as far as their RIGHT to grab it, but grey area as to whether it's worth the bother for them to grab it, since chances are they'll go with something like Mummy3movie.com or m-3movie.com, etc.
If by some chance they let you keep it, you might make some small traffic on it, but I think it would be tiny.
There's just no good reason these days to grab TM'd names or TM typos. I'll let others talk about the morals of it, I'm only referring to hassle/law/being worthwhile. When the movie's out you'll probably get a C & D (Cease and Desist) order pretty quickly, and a demand to push the name over to them. If you comply without arguing, usually it ends there and then. If you argue, it'll get messy, expensive, and then you'll still end up pushing the name to them.
Many many Namepro members have had this wonderful C & D experience, including both myself and my domaining pard. Even a year ago it was hit or miss as to whether it was worth it, but today it's just completely not worth it, the laws are solidifying and becoming very clear and in favor of TM holders.
Even though I have a handful of TM names, ahem, I would never get another, and I should drop these but I've been too lazy... but will certainly let them expire, never to reg their like again, ha.
Or, you could ask your registrar to drop the name, even if it's too late for a refund.
Sorry about that
