First trailer this year and obviously I had to choose one you aren't able to watch (the film that is, not the trailer, obviously); Renato Polselli's (as "Ralph Brown") Italian horror movie MANIA from 1974. Unfortunately, the film remains un-released everywhere. :(
But watch the trailer in any case (altho maybe you shouldn't; it's so cool you'll live in deep depression for years to come because you can't watch the film!).