Alien Quadrilogy, ALIENS Comes to BluRay

The Alien Quadrilogy and ALIENS are both coming to BluRay in seperate releases. Online retailers have pre-orders available for both BluRay's but no release dates or specs.

I own the Quadrilogy set on DVD and love it. I am curious to see what they can offer on the BluRay release that will give us incentive to go buy it for those who already own the films on DVD.