Am I legally allowed to create a site about a new upcoming movie if I don't use the name of the movie or any trademarks held by that movie in my domain name?
Don't use any images or clips of the movie or trademarks in the site. You can legallly do a review of the movie with no issue. Most movies will have a press package of clips and images that you can use. Be sure to ask for those images and stick to them.