I was surprised when I didn't see a horde mode option actually. I think the further you survive, the better the loot chance at the end. Make some maps specifically for this game mode, and I'd like to see some objectives to complete (think ecleon in Fuse) rather than just kill things. Also, as you get further, the game could add random modifiers to the enemies to make it tougher every wave
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or like mass effects 3 multiplayer missions where every couple of wave there is a mission. random modifiers (like skulls in Halo:Reach) are a good idea as long as nightfall isnt in that table of them. i will be happy.