For Brett's death, the film substitutes a quick insert in lieu of the dripping blood that was originally shot. Also, the scene originally ran longer to show Parker and Ripley running into the landing leg chamber in time to glimse the Alien escaping into the air vent.
Alien 5 being a prequel confirmed-: http://www.totalfilm.com/news/alien-5... It's actually a prequel movie that will explain the origins of the space jockey spaceship.
Plot: The story begins when the crew of the commercial transport ship Nostromo receive a transmission which might be of nonhuman origin.
They land on the deserted moon Acheron LV-426 and find a derelict spaceship with a dead alien and many large eggs.
Directed by Ridley Scott © 20th Century Fox
I recommend the High Quality version
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This article covers all the known deleted scenes from the 1979 film Alien. Some of these...