Depending on continuity "Nightwing" is either species of Kryptonian nocturnal bird (just as a "flamebird" originally was), or the only known name of a legendary hero (a son who was cast out of his noble house, and became a protector of the underdg regardless). Does it have a new interpretation now?
Can't say that ANOTHER firebird wearing heroine (possibly with god-delusions) is doing much to impress me as a novel idea.