Figured it'd be useful to round up what we know for 2021 releases.
>January 1: Demon Slayer Tamagotchi comes to the USA. Two colors are available at GameStop, while a third is Amazon exclusive.>January 7: 4th wave of US replica shells. Includes one P1 (Plaid) and two P2 (Stone, Tie Dye).>January 16: Second wave of Evatchi shells release in Japan (see OP >>8593803 )>February 11: Extellatchi releases in Japan along with the Fate/EXTELLA Celebration BOX. No word on individual sale of the model yet.>March (date unknown): Demon Slayer Tamagotchi Hashira Gathering Version releases its first shell (Kyojuro model, red) in Japan.>April (date unknown): Remaining DST Hashira models released in Japan.>April (date unknown): Europe wave 4 of replica shells. Incudes aforementioned Plaid, Stone, and Tie Dye shells. Includes two shells, one P1 (Marble) and one P2 (Spring Stripes) that currently have not been announced for the USA.>June 1: Evatchi and Demon Slayer Tamagotchi wave 2 release in the USA.>Other/Unknown: >>8633803 still has yet to be announced or priced. 