On that Super Smash Bros Channel update:
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The last one was on October 27th. The Terry video became public on November 6th. So a week and a half later. That would mean that this video would air around November 21st, if it took just as long to air after upload. That is if they follow the same schedule.
November 21st is Nintendo Day. Both Super Smash Bros. Melee and Super Smash Bros. for Wii U launched on 11/21 in Japan. Other games to launch on this day in Japan include titles such as Super Mario World, Super Mario 3D World, F-Zero, The Legend of Zelda: A Link to the Past, The Legend of Zelda: Ocarina of Time, Yoshi's Cookie, Pokémon Gold and Silver, Pokémon Ruby and Sapphire, Pokémon Colosseum, Pokémon Omega Ruby and Alpha Sapphire, Sin & Punishment, Animal Crossing amiibo Festival, Animal Crossing Pocket Camp, and possibly more. The Super Famicom also launched on this day. In North America, a few of these games launched either on that day or on the day later as international releases, including Super Smash Bros For Wii U. The release of Donkey Kong Country, Donkey Kong Country Returns, Super Mario 64 DS, Metroid Prime Hunters: First Hunt, and the Nintendo DS itself all launched on this day.
I believe Polygon covered on this day.
https://www.polygon.com/2017/11/21/16685300/nintendo-biggest-best-release-date-games