http://www.gameinformer.com/b/news/...n-the-legend-of-zelda-breath-of-the-wild.aspx
The developers of Xenoblade Chronicles X are helping Nintendo with the massive task of building The Legend of Zelda: Breath of the Wilds open world.
During an interview at E3, legendary developer Shigeru Miyamoto told us, Yes they are involved in this Zelda. People from Tokyo and Kyoto are working together on this. There is a team of over 100 [from Monolith] helping work on this project, and their work has really been helpful.