Where would I like to see a second ODST game take place? Personally I'd like it on an old Human colony that was destroyed during the HCW. Except now it's inhabited by a splinter-Covenant faction. The mission is simple, well at first, as the goal is for the squad of 5 to wipe it off hostiles. As for the when, definitely during the Created Conflict. Half way through the game a Guardian shows up and Prometheans etc start appearing or maybe coming out of the Guardian itself. All that matters for the squad now is to survive and evac if possible, but it's going to be a perilous joruney.