this is a couple of my thoughts, so forgive me for sounding as if im rambling.
Now, first off, the planet is enhabited by humans. For a moment, me and my wife thoght that they were humans that came from earth the sera. But what with the COG still using helicopters and generaly modern weapons (other then the hammer of dawn) I don'y think they have quite achieved space travel.
In the art book that comes with the LE gears 1, they say that the Locust resemble the native people of Sera. Who are these native people? Were they forced to go under ground? I want to know!
The Brumak was said to have DNA of native apes, but it looks a little like a reptile. So we know they have monkies on this planet, but what else could they have? What creature could the Corpser come from? or the kryll? How come we never hear about anyhting like dogs, or cats, or even birds? I know birds exist, but are they birds we have here, on earth?
Which leads us the believe that this is an "alien" race. But an alien race wouldnt come from underground. They would have to be here before us. So did people come to sera from somewhere else?
also, what is its landmass like? Does it have 7 contenents like us, or what? I know they have countires overseas, but do they speak different languages? I know some are more porr then others, so that leads me to believe that they have different forms of goverment,
these are questions I want you to think about.