Best case scenario: A Wonder Woman who's left Themyscria a long time ago and has already met Bruce who eventually as time passes becomes his love interest. As a DCAU fan, I'd be cheering.
Likely scenarios: Vicki Vale, as a counter for Lois Lane or Pamela Isely as the casting call called for "any ethnicity", and for those characters I don't think it matters that much If it's the latter, I assume she'll end up going green in the movie and I imagine she'll only be Bruce's love interest in the first half, probably using his wealth for environmental purposes. I guess we'll be seeing this happen in the movie later:
Unlikely Scenario: Catwoman, as she was done in TDKR