Nintendo formally revealed The Legend of Zelda: Breath of the Wild during a special livestream for E3 2016. Quite a lot of footage has been shown off, highlighting the dozens of new mechanics that the new game has to offer.
One interesting detail that has been revealed is that Link will not be assisted by a traditional partner as he embarks on his new adventure. Past games featured partners like Navi, Fi, and Midna. Instead, Link will encounter stray NPCs. This was demonstrated during the first part of the livestream where Link came across a mysterious old man within just a few moments of heading out into Hyrule.