Who will/should Leia reunite with?

Her brother or son? It doesn't look likely that she'd reunite with both of them in the same movie since one or the other makes for a stronger emotional climax in episode 9, depending on whether she makes it there with a different actor or she's written out/killed off screen. It would make more sense if she reunited with Luke in episode 8 as a way of banding together and preparing for a more personal confrontation with Kylo in the final film to win him back or kill him if they have to.