If both Giger's drones & Cameron's warriors end up in the game it will be great news, since those are by far my favourite designs. It would make sense if you only fought warriors close to a hive area where they could blend in with the environment better. The way I imagine it, they would be even tougher that the drones, soaking up more bullets before going down, as we saw them take pistol rounds to the head in Aliens without even flinching.