I'm feeling November 2022 guys
Arceus comes in January and we have Splatoon 3 in the middle of the year
I don't see Nintendo releasing their IPs too close to cannibalize themselves. Zelda was the last announced, so probably will be the last released
They said it was "aiming" for 2022 so its definitely in the latter half of the year. Reminds me a bit of when Sony first announced Horizon Forbbiden West was targeting 2021, fast forward and they're still unsure whether it will make the end of the year.