PvE node rewards tend to be static, so I expect Another Purple cover for Howard at the end of Webbed Wonder. In fact, I just spent 800 HP resetting my WW vault so it didn’t have a Purple cover - my Howard is 2/1/4, so the odds of me being able to use it is pretty low.
PvP rewards are a lot more fluid though. A blue cover would be nice since it was the top PvE reward. Even better if they follow Peggy Carter’s example and hand out two covers.