Dent wasn't even mentioned in the first movie. Neither were Maroni, Sionis/Black Mask, Penguin, or any other new characters that are going to be featured in this film. So what exactly makes Catwoman or Selina any different. Catwoman and Black Mask have so much history together that it is a sin to have him without her. Batman and Catwoman/Bruce and Selina have a ton in common with eachother, and she is the one love interest out all from the comics that is relatable with him in anyway shape or form. If done right, it is a perfect contrast. This film needs to focus on Batman and his war against the criminals of Gotham. Therefore, if they have a love interest, they can not have some damsel-in-distress that he has to save 2 or 3 times throughout the film. The lead female needs to be strong and centered in this movie, or else there should not be any love/romantic interest in it at all.
Selina for love interest
No love interest
Any other