Fans asked the developers of #Zelda: Tri Force Heroes: “Where does the game fall in the series timeline?” pic.twitter.com/Nt8zaCq2BE

— Nintendo of America (@NintendoAmerica) October 22, 2015

As Wright points out, that's not entirely true. The Iwata Asks segment on Majora's Mask makes it clear they intended from the get go to make a game that largely recycled Ocarina of Time's engine, assets, etc.

In that regard it appears to be quite like Tri Force Heroes, with the distinction being that Majora's Mask actually became more different from Ocarina than originally planned as time went on,* whereas this game was apparently a multiplayer-first game from the get go (admittedly I'm not 100% sure about that though). I think that's what spemanig might have meant in his comments, but it's ambiguous enough that I'm not completely sure.

*The concept of the big distinguishing feature, the three-day cycle, entered early in development, but only because another developer already had that idea ready to use and it was apparently decided that using the cycle would cut down on the amount of things that would need to be developed. Which is an...optimistic...conclusion to reach, in my opinion.

So, the same Link as ALBW. What does Goodnightmoon has to say about this?

And even so, it's a mainline title and in the timeline. Uh uh uh...

Honestly, depending on how much content is in the game, I feel like the game acting as dlc would be too big, if it packs a large amount of levels. I feel it is warranted as a standalone downloadable game or as an expansion, like Super Luigi Bros U, which so also happens to be 20 USDs... o:

Go figure.

So, we can safely conclude we're on a mainline Zelda games decadence?

That´s new, little time ago Shikata said

"“The king is a firm believer in this legend, in this prophecy that exists within their kingdom, of three heroes that come together to form a totem. The king understands from this legend that describes the true hero as someone with these long sideburns and this particular hair style and these long ears. So the king from amongst these people is able to find the correct ones. The people who meet his conditions are the true heroes.”

So basically he is saying that the heroes are just people that happens to look like the true hero, and that makes sense with the dialogues in the game. Now they are saying one of those 3 links is the same from ALBW wich does not makes sense since who are the other 2 then? 

Anyway my point of what I said stays the same, is an ambiguous trio where everybody is link but no one is and the princess is not Zelda. Not that any of this matters though,  seeing someone offended because you can dress the main character as a woman on a game like this is still funny wether is Link or not.

Hink and Zink, from the kingdoms of Siderule and Midrule, respectively.

Obviously.

MM itself was always planned as a new game, yes, but recall that initially the plan was for a Zelda on the DD, which was more or less a Master Quest. The usage of the assets, according to somebody actually involved (I will take Aonuma's word over somebody uninvolved with the game, with all due respect to Iwata), was purely a design choice. After all, to paraphrase Aonuma, he challenged Miyamoto's initial request for Zelda Gaiden because he felt the OoT dungeons were perfect/impossible to improve as it was. 

That said, mind you, I wasn't necessarily agreeing with spemanig's point when I elaborated. MM is my favorite Zelda game, but it's pretty much exactly what TFH is except to a greater extent (and also because it was developed by the main team).

Hmm, I might just be misunderstanding you here, but one of the persons who said the reuse of assets was a necessity instead of a choice was Aonouma.

http://iwataasks.nintendo.com/interviews/#/3ds/majoras-mask-3d/0/0

Aonuma:   You're right. Since we already made The Legend of Zelda: Ocarina of Time², we had 3D models that we invested a lot of time in to build. This all started by (Shigeru) Miyamoto-san asking whether we could make a game in one year if we repurpose the models. But we were already talking about trying to make Master Quest³ for Nintendo 64DD⁴.

Essentially, the way I read it Majora's Mask was always distinct from Master Quest, but it would only be allowed to proceed if they recycled Ocarina of Time stuff so as to pop it out in a year. In that sense, it really does seem to be a cousin to Tri Force Heroes. Both games were part of a deliberate attempt to reuse one game to quickly pump out another, and while both games are quite distinct from their predecessor I'd argue with confidence that Tri Force Heroes set out to be more different from its origin than Majora's Mask did.*

*Not a slam against Majora's though. I <3 that game...

I was actually thinking specifically of NSLU when I said expansion. $20 of quality.