If it's going to have both Kat and Emmett in it, are they going to include all things that the other characters have?
I'm thinking they both will have a standard costume, and two unlockables.
Also, would they have minions? I've played Gravity Rush so for Kat I was thinking that her minion could be either Dusty (Her cat) or Raven (Another gravity shifter from the game). As for Emmett, I haven't played Starhawk so I have no idea what his minion would be.
For a level, maybe it could be a GR level that, at some point, gets pulled into space through a gravity hole, and BAM! Starhawk setting.
Just openly thinking is all.