A pred Alien Queen would be somthing, but I'm sure they wouldnt take that risk, although it would help explain the Aliens that just come out of the sewers "Turtles Style"
The brothers gave a couple of small hints on one of the forums (can't remember which one) about naming the Heads. It was somthing along the lines of "marking the props, for things like if a prop gets battle damaged they have to mark it so they remember for next time"
So this could either either mean
A) There will be another Grid Style Hero Alien (or Multiple hero aliens),
B) There will be at least 2 varations of Alien (minus the Hybrid, I'm pretty sure they could tell which one that was!!)
I think we'll see, the Runners, regular and the Hybrid. Plus the One Hunter.
Which brings us back to the Million dollar question.............Where are the eggs coming from?