The Hero Is Defeated
The longest timeline currently out there, The Hero Is Defeated features the majority of the top-down Zelda titles and is more focused on the constant resurrection of Ganon. Given that Breath of the Wild has made a rather big deal out of the Calamity Ganon, it could be referencing the many times he has returned to create chaos on the world of Hyrule. During the last trailer, we clearly get to see a monstrous form looming over Hyrule Castle, which could easily be Ganon in another form via his magic.
The only other hint of this came from Nintendo, which released this art that references the first game on the NES. However, this appears to be just another homage to the series and not definitive proof that Nintendo is going to place this title in the same timeline. While it’s fully possible to slot Breath of the Wild into The Hero is Defeated timeline, there so far haven’t been as many connections with this timeline.