It looks like the Nightwing mantle is being passed down to a new character in the upcoming Batman #28. Nightwing's solo title will be ending this April and Dick has been absent from a lot preview art for Batman Eternal.
Harper Row looks like she will be taking over the role of Nightwing. She is a gadgeteer genius who has been a reoccurring character in Batman's series since March 2012. It looks like she will be adding her technical flair to the Nightwing outfit though I am not sure about the giant gun.
Not sure what is happening to Dick but hopefully that doesn't negatively impact fans reaction over Harper.