I think that there will be a reunion but an character and luffy's has to save his friends that he has made over time.
We don't much about the current Reverie yet. All we know is that every kingdom are going to attend. It might get its moment or not. Who knows? We'll see what Mr. Oda has in mind.
There's no reunion. Mysterious character was revealed. Again, I apologize for spoiler lol
What do you think?