I'm not sure how the licensing rights work on Aliens Vs. Pred, Aliens, Alien, Alien Resurrection, Alien 3, etc., etc., and then of course Predator 1 & 2...
For some reason I was thinking that the licenses aren't intertwined. That's not to say it couldn't happen though of course, I just am not sure how easy it would be. Don't see much Predator stuff actually.
The keychain thing is weird... Then again, these figures are weird overall. I mean, imagine if while waiting in line to checkout, Star Wars figures were super articulated kits like this in blind packages you just picked up as you bought your groceries like this?
The keychain concept is an Asian Market thing I'm guessing... These are seemingly meant for teens or young adults... Their market for toys has the focus on the people with the finances. It's really ahead of the game compared to the US Market most of the time, and thus kickass toys like this show up.