Well if this Batman has a theme it's not great enough for me to know it. Look at Indiana Jones, Superman, James Bond all have iconic, recognisable, grand themes.
The same can't really be said about this Batman mostly becuase I think the music and score is uninspired.
I like the USE of music in this movie, the action scenes aren't overblown with it, infact, the music is almost absent in the action scenes, but a great, grand, theme is needed for Batman.
Straining to think about I think I can scarely hear it my head but it's not something grand and awesome that you can hum/vocalize out loud like Superman's theme or Indy's.