What I really would want to see is an engaging story. More prominent characters that make a difference then people telling you, "go here, do this." Better missions then "sit at door, survive, kill waves, and then go through door." I want the stuff we're doing matter and have a point. Us killing the heart of darkness changed nothing. The Traveler is still in the same state he was before we killed the heart. For the class you pick to stand out more. More design options for your character so you can change how a legendary armor piece looks, but not an exotics. More space for items. Different feeling guns when using legendaries which it looks like TTK is a step in that direction thankfully. For the Tank class to not be outshined due to another class having an exotic armor piece(Ram). This could really go on for a while so I'll stop now.