It seems that we could be receiving of Nintendo Letter Box for the Switch as Nintendo have filed a trademark for Swapnote in Japan.
Filed today, Swapnote originally launched for 3DS back in 2011. While Japanese gamers know the game as Swapnote, Nintendo released the game in North America and Europe under the title Nintendo Letter Box.
In this article:3DS, Japan, Nintendo, Nintendo 3DS, Nintendo Letter Box, Swapnote