The Nintendo Direct will take place on Wednesday, September 13 at 11pm BST/12am CEST and 6pm ET/3pm PT in the United States.
The tag was soon deleted, which means it was either posted in error or Nintendo has something to hide.
Mario & Rabbids Kingdom Battle is out but there's plenty more coming to the Nintendo Switch and 3DS consoles this year.
We do know there will be new details on Super Mario Odyssey.
Other games expected to feature include Skyrim Switch Edition and Federation Internationale de Football Association 18, which are both out this year.
The handheld touchscreen could be used to create levels, which could be played on the go, or on the big screen.