Below you can find the last page spoiler for Batwing #19 revealing the new hero in the costume.
DC Comics posted the following image, and it happens to be the son of Lucius Fox with Luke Fox.
It’s time for a new beginning for David Zavimbe and Batman now understands his difficult decision to resign as Batwing. But Batman still needs a Batman Inc. agent to shut down the Marabunta gunrunners and save the lives of the children in the Democratic Republic of Congo (DRC).
It’s time to recruit his first choice for Batwing: recent M.I.T. graduate, trained martial artist, and son of one of Wayne Enterprises’ most important employees: Luke Fox!