One theory I've seen floating around is that we are going to see Khan again. I believe the show runners have hinted that they were influenced by the TOS movies and then there was the Khan folder at the end of season 2 as well.
Another theory is that Picard's long lost son will show up, even though we sort of already had that episode already. This could also be influenced by the movies.
Another theory is that Picard's long lost son will show up, even though we sort of already had that episode already. This could also be influenced by the movies.