Well, I've got some (maybe) good news and bad news for ya.
Randy Falk, NECA's Director of Product Development, gave an interview to the guys over at Figures.com.
There was some discussion on the forthcoming 18" Alien, including possible plans for a smaller scale Alien figure.
Unfortunately, the 18" Predator might not see the light of day.
Excerpt:
"Figures.com: In addition to Aliens vs. Predator: Requiem figures, NECA has announced an 18" Alien from the original film. Will the latter be a new sculpt or based on the classic Kenner/Tsukuda designs? When can fans expect to see it hit retail?
Randy Falk (Randy): The 18" Alien is an all-new sculpt that literally took forever. Our lead sculptor, Kyle Windrix, is one of the biggest Alien fans ever and he set out to really nail every detail. There have been a lot of Alien toys before, and some are better then others, but there has never been one that is fully movie accurate in terms of detail or proportions. This is the definitive Alien figure and it will be available this Spring.
Figures.com: Are there plans for figures based on the other Alien and/or Predator movies? Obviously fans would love to see an 18" Predator.
Randy: Hopefully we will offer the original 18" Alien figure in the smaller 7"-8" scale and perhaps an Aliens Warrior. Beyond that I'm not sure. I would loveto see an 18" Predator as much as anyone, but the 18" figures cost a lot to produce and the retail climate along with the economy and rising costs to manufacture make that a long shot for the time being."