Since Damien's death fan shave brought up Harper Row's name. She's a creation of Scott Snyder's - a poor high school girl who's also an underground worker in Gotham City's electrical grid. In addition to the above preview, Today News also have an interview with Snyder, and although he's happy to discuss Row, all he'll say when asked outright if she'll become Robin is:
"She's definitely a really important character. She's a character that means a lot to me personally, and we definitely have plans for her in Gotham."
UPDATE: Here is the cover to
Detective Comics #21, the solicitation of which says that Batman teams up with Harper Row - and as you can see, she ain't wearing a Robin outfit! But it seems clear she WILL be the Caped Crusader's new sidekick at least.