The Legend of Zelda: Breath of the Wild has now been given an official placement on the Legend of Zelda series timeline, but things aren't quite as simple as we might have hoped.
The Zelda series' timeline had been heavily speculated by fans for years until finally, saving any additional future torment, Nintendo released an official version inside a book called the Hyrule Historia. Naturally, with Breath of the Wild being released after this book, its position on this timeline wasn't immediately confirmed. The game has now been added to the Zelda 'History' portal on Nintendo's Japanese site, however, as seen below.
Breath of the Wild is sitting right at the very bottom, all on its own in a box without any connections. Essentially, the game has been confirmed to take place after all entries before it, sitting right at the very end of the timeline, but doesn't seem to have any connection to any of the three previously revealed timeline arcs.
Speaking to Famitsu (and translated by Siliconera), series producer Eiji Aonuma and director Hidemaro Fujibayashi discussed what this means in a little more detail:
Eiji Aonuma: “Well of course it’s at the very end. But, I get what you’re asking, it’s which timeline is it the end of?”
Aonuma: “Hyrule’s history changes with time. When we think of the next game and what we want to do with it, we might think, “Oh, this’ll fit well”, and place it neatly into the timeline, but sometimes we... have to change the placement. Actually, the decided history has been tweaked many times.” (laughs)
Fujibayashi: “Lately within the company, a term called ‘New Translation’ has cropped up. (laughs) Strictly speaking, we don’t change it, but rather new information and truths come to light."
So it definitely sits at the end of the timeline, but its final placement isn't properly decided... We'll leave this one up to you lovely readers to figure out in the comments.