That looks like the terrain copied from the water shader demo with a model... arm??? added. The backdrop is the one included in it, as well.
I don't doubt you're going to have a good game, it's just a bit early for a WIP, considering you're pretty much using someone else's media and code at this point. (I'm not talking about the arm, I'm sure you made that yourself).
What style of game will it be? The main thing that identifies WWI is long periods of entrenched warfare. France was devestated because so much of the war was fought there for so long, but it wasn't glamorous First Person Shooter combat. It was dirty, cold, wet, diseased fighting without end. If you made a FPS WWI game, it wouldn't take advantage of WWI's uniqueness. Rather, it would be a generic FPS game with some WWI media.
Come see the WIP!