Remember Darci, that strange supermodel that appeared in one episode of Superman and one episode of Static Shock? No? Well, Sunsetriders7 did.
Jesus, he really is going to adapt every girl from the DCAU, the absolute madman!
You're right, it's easy to forget that Audrey was a one-episode character considering how much content she has in the game (and there's still more to come).
I am certain they'll bring out time travel in future updates. It's definitely happening before they do Marvel girls (that would probably be its own game anyway.)
Time travel gives you the Dee Dees, Dana, Melanie, Queen, Inque, Curare, Aquagirl, Max, Ro,
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...
The Dee Dees would be pretty popular, I'm sure. Ro is rather obscure and less likely, but if Sunset likes her then she could be added next update if he feels like it. She's very cute so I wouldn't complain!
My personal dream addition for time travel would be
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from Batman Beyond. An on-model Max would be very fun to play with.