The Joy-Con of the "Nintendo Switch 2" may be a mouse? Movement like sliding on the ground in the announcement video - what seems to be an optical sensor and a special attachment

The Joy-Con of the "Nintendo Switch 2" may be a mouse? Movement like sliding on the ground in the announcement video - what seems to be an optical sensor and a special attachment
Dreams such as "There is a possibility that Splatoon can be operated with a mouse!?" and "It may be easier to port a game that is optimized for PC"....

The linked article is in Japanese.