I am not jumping hoops. We will never know what we don't see outside of the film. Past present and future. This probably the end of this version. The name does not matter. If they called him Dick Grayson him being a new take on Robin would have been known a long time ago. Also Bruce's retirement/fake death.
I like that the movie leaves the future vague. We don't know for surethat Bruce is done forever as Batman. Or if he and Selina will stay together. What happens to Robin Blake. Its open for speculation. We will never know. Its either a definite ending to Bruce as Batman or an end to this chapter in his life, with no sequels.