In The Dark Knight Rises, when Batman shows up on the day of heist in the StockExchange, the anchor in a news channel is speaking the story with a alot of excitement and informs that what appears to be Batman has finally returned after 8 years. Hearing this, Selina Kyle says:
Well, what do you know?
What is it, a soliloquy or a desperate question to the anchor out of the joy/anger she was feeling then?
Also, what does it mean actually? I think, it means that there is more to know about Batman in the coming time although I am not sure about it. Is my interpretation correct here?