Nintendo has confirmed that it will hold two consecutive Direct presentations on September 8 and 9. The first broadcast will commemorate the 40th anniversary of The Legend of Zelda series, followed by a general Direct presentation the next day, which will be succeeded by live gameplay demonstrations from Nintendo Treehouse: Live.
The Legend of Zelda 40th Anniversary Special Direct is scheduled for September 8, with start times at 7 AM PT, 10 AM ET, 3 PM BST, and 4 PM CEST, and the program will last approximately 30 minutes.
The Nintendo General Direct will air at the same time on September 9 and is expected to last approximately 45 minutes. Current information has not yet revealed the specific game lineups for either broadcast.
Following the conclusion of the General Direct, Nintendo Treehouse: Live will begin immediately, showcasing live gameplay footage via stream. These related live events will proceed consecutively in the order mentioned above.

