Personally, I don't think cgi or 3-D has in anyway been used to true ALIEN effect. both Scott and Cameron experimented with weird walking crawling postures, two guys in a suit, dangled by wires, speeded up film... If they had computers back then they would have MILKED THEM for every Mb of weirdness to challenge our perceptions. If these guys still have it and have the courage to break with convention, and more importantly fan expectation this could be something special... but it would have to be something we haven't seen yet. Something truly ALIEN.