Simple. What will win worlds will be between these three decks: Megazone, Stage 1 Rush, or Reshiplosion. All three of them are basically the top 3 decks in our format right now, so any of those 3 decks will likely win this year's worlds.
For each division, I can see Reshiplosion winning Juniors, Megazone winning Seniors, and Stage 1 Rush winning Masters, although it can go the other way around. Plus, who even knows. Maybe some weird but really good deck will win worlds this year, like Xander's Yanmega/Vileplume/Ursaring/Roserade deck, or maybe even a secret deck made to counter the metagame like this one deck that is recently being talked about in Japan built by Yamato.