Prometheus is the prequel to the Alien movie series that started in 1979. The makers have been secretive about it, but so far images and a trailer from the movie make it look very good. The alien we are used to will not be making an appearance, but the start of humanity is the subject. Sounds like an idea right out of Ancient Aliens.
Revelations of the Mayans 2012 and Beyond is the name of the documentary which claims will show actual proof of extraterrestrial visitation. This has been said before, but the names involved with this project seem legitimate. I can't wait for this one to come out either, but it has not yet been listed in IMDB or anywhere else yet.