Click here for Wild Mass Guessing for the series as a whole.
Luigi will literally have to fight his fears.Luigi will have to go head to head with his fears in the dream world. A ghost will be one of the bosses, and the final boss will be his nightmare.
Luigi's dreams will involve characters and situations from past Mario & Luigi games, perhaps mixed up or misremembered.Look at these characters◊. Don't they look like Hoohooligans?
This game will actually tap into the darkness in Luigi's heart.Think about it. For three games (Mario and Luigi Superstar Saga, Super Paper Mario and Super Smash Brothers Brawl), Luigi's stated to have a dark side and/or a dark secret that he doesn't want Mario to know about. With Mario in Luigi's dream, we'll tap into this darkness that will be scene as a nightmare sequence with actual Nightmare Fuel and actually get the full details of what Luigi's been hiding.
There will be a sewer area in Luigi's dream world......and you change the water levels by putting Luigi's hand in warm water.
The Zeekeeper is Empyrea's mate...
A form of Bowser is going to be the final boss
There will be an alternate universe
Fawful will be a Bonus BossIn Luigi's dreams. But it will only be a figment of Luigi's mind, not the real Fawful. This would be a loophole to keep him around for his popularity and still comply with his death in the previous game.
Bowser will once again be the tutorial boss, somehow.In all previous games, Bowser had served as a tutorial boss (Partners in Time technically counts, since there were two of them — each for the baby and adult Marios — and the first one was Baby Bowser). Since each one had Luigi at the sidelines, maybe it could take place when Mario jumps into the dream world to save Peach, only to encounter a dream world version of Bowser. This saves the game's plot from having to bring the real Bowser to Pi'illo Island until later on, much like how Partners in Time handled the adult Bowser.
The final Giant Luigi boss will be Giant Bowser.It would be the perfect throwback to the prior game and a definite crowning moment of awesome for Luigi, taking out Bowser with minimal help from Mario.
The game will be Hijacked By Wart.Wart will be revealed as the one pulling the strings the whole time, using Antasma as a proxy minion in order to enact revenge against the Mario Bros.
Antasma will have some past connection with Cackletta.At least, from before the Pi'llows banished him, of course.
The Kylie Koopa seen in this game is a descendant of the one seen in Partners In Time.This explains two things: One, why she doesn't remember meeting the Mario Bros.; and two, why she doesn't look like she's aged a bit. Mario and Luigi actually met her ancestor (possibly her mother or grandmother) in Partners In Time; they did meet in the Mushroom Kingdom of the past, after all.
Version 1.2 of the game will fix the gyro controls.Version 1.1 came out on September 5th, but it only fixed the freezing issues of the game. The next version, Version 1.2, will fix the gyro control issues that prevent it from registering.