From what I've read...
It seems like the whole and only point of the scene is to show people that Bruce is still alive and for Alfred to see that, but aside from that, the impression that I've gotten is that the scene only answers those two things, leaving everything else a mystery (new identity, status with Selina, etc).
That matches up with what a reliable person on Nolanfans told me. Except that he said the way they make a big deal out of the scene in regards to who Bruce is with inside the cafe, combined with the interaction between the two throughout the movie, leaves no doubt that Bruce and Selina ended up together. She changed her identity, but he said it's never explain if Bruce did too. Keep in mind that this person says that he didn't like how Bruce seems to give "everything" up just for the sake of being with Selina.