Monolith Soft, makers of the Xenoblade games, are working with Nintendo on The Legend of Zelda: Breath of the Wild. Nintendo's creative fellow Shigeru Miyamoto told Game Informer that Nintendo had enlisted help from the team on its upcoming Wii U and NX game, which made a major appearance on the E3 2016 showfloor.
Breath of Wild is set to be the biggest Zelda game to date, one that returns to the series' more non-linear roots. In what capacity Monolith Soft is helping is unknown, but the team is familiar with designing open-world games: Xenoblade Chronicles X on Wii U is set in an expansive universe. Monolith also has other Zelda games on its resume, having contributed to the divisive Skyward Sword on Wii and A Link Between Worlds for 3DS.
Nintendo bought Monolith Soft from Namco back in 2007, and it now primarily develops Wii U and 3DS games. Its Kyoto-based studio has credits on Animal Crossing: New Leaf, Splatoon and Pikmin 3, among other Nintendo projects.