Doubt they'll go for the Day Night cycle, since the world already looks like it's going to be insanely reactive and that'll just put an over the top layer on it (if they add NPC schedules with the cycle, since they won't do it for purely aesthetic reasons apparently.)
So far the only obvious stretch goal is to add more possible origins. Glad to see there's an arena already, but they could probably make it a stretch goal to really pump it to the brim with combat. I'd like to see some competitive arena fights, where two teams are fighting to defeat their enemies before each other (and maybe can even interfere with each other at the same time.) Not sure what other specific stretch goals they have in mind though.
