You've already seen what outdoors of Steel Storm look like (although it's still a work in progress).
This is the first screenshot featuring an indoor area of Steel Storm 2:
Finally, IndieGoGo crowdfunding campaign for Steel Storm 2 has kicked off:
All fans of Steel Storm: Burning Retribution, please come and check it out. Helping us spread the word means a lot! Thank you!
I got a terrain candidate to be most likely in the first level of Steel Storm 2. Never mind missing sky, it will come soon and will create an illusion of even larger space. Did someone say idTech 4 can't handle large terrains?
Note that a tiny black spec around the center of the first image is a vehicle.