Don't get your hopes to high folks because it will most likely be 4 new smartphone games. lol

I would agree, but that would be an announcement suited to a Nintendo Direct. Over the years anybody notice that unless it is multiplatform, all Japanese third party Nintendo games are announced through a direct? 

I think will be in a direct, but additional information at TGS

Then that would be a very probable possibility. 

Omg I wonder if Yoko Taro's next project will be announced there...or maybe Babylon's Fall is his next project?.
Regarding Bravely, I agree with the people saying it's more probable that it'll be announced in a future Direct (well, if the game is actually a thing), but if it appears at TGS I would definitely be happy.

One is likely going to be Bravely Third, they've been teasing it since last year and now that Octopath is out there's nothing stopping them from announcing it, it's also the kind of announcement that seems fitting for TGS, unless they prefer to annunce it in advance in the now delayed Nintendo Direct

I think it's around that time for Square to do another Dragon Quest Monsters game. This would also explain why monsters exclusive to the Dragon Quest Monsters series have shown up in Dragon Quest XI, maybe to get models and animations ready for a new game perhaps.

You really never know with SE. Expect the unexpected.

Because they're still doing FF15 DLC and the next main game will be 7 remake.

FF16 aint coming for quite a while.