Chest bursting scene sucked in regards to to facial reaction of the character it happened to.
Oh, and more canon talk...as if we somehow forgot.
"You'll feel that Alien 3 is a better film for it."
f**k off!
EDIT
Apparently the mind set of the new xenos are that it's all part of some sort of Alien Hive hierarchy. We'll get to see how the Spitter and such even exist....they'll also...show what might happen without a queen, or at least the question was considered by the team. And so on...so at the very least, there should be, I think, more than one explanation for the different kinds of Xenos. Hopefully mostly all of them are good.