The reason people are going Ape(Alien)-shit over this is because Ridley has not done any Sci-Fi for 25 years. He's talked about doing Brave New World and Forever War the last 5 years and now he is talking about Alien.
He has not actually done it yet though, but to hear him get all riled up like that means FINALLY we are getting sci-fi again.
I hope he does Forever War. He's wanted to do it his whole life and he recently got the rights as of a year or two ago.