guys guys guys guys... Have you considered using Cryengine 3 for this?
Essentially, from what I'm reading, your plans sound like an improved, halo-based... Borderlands running on Cryengine 3?
The more i read your guys's ideas the more i look back at my first post for this and think that it was very broad info, you guys are going so far in depth haha, nothing i really thought of because i didnt think i would have success this is completely amazing reading all these ideas
-snip-I was actually just playing Crysis 3 last night and thought about that haha. I think CryEngine 3 would make the game beautiful, it would allow us to export on any platform (but it's halo so no Sony xD). My only question is can it handle a massive "Open World"? If so, I would love to use CE3 over the other two.