One thing I felt was missing from CBH was the lack of feeling like you were in an active, breathing, world. The world almost resets between turns with little change other than the status of specific characters.
Reading through the journal I think this has been addressed with CBU with the storyline and event functionality. Can we use for example to create the sense of having a nemesis, a rival, as Lux Luthor to Superman situation across issues? Where a villain targets a hero, maybe targets the hero's allies and/or teams up with other villains ala Sinister Six?