The Alien movies are being put out in a "Anthology" in Blue Ray sometime in Oct, the cost will be in the neighborhood of $179.00 (US). This should be quite the package seeing that it comes in a six disc pack. It will contain all four movies with a great deal of behind the scenes information and interviews of the different cast members. The package will contain the original movie along with the revised versions (extended), so you can see both versions of each movie.
Should be interesting to how it sells. If it does good you will probably see more of these packages from other movies like the Indy series, Star Wars, etc.