I'm basically going to go "what
@DJ-Mika said" with regards to why they weren't in NH beforehand.
Very glad to see the Splatoon amiibo have been restocked in the UK (and I'm
tempted), still very much holding out that they'll restock the Zelda 30th Anniversary amiibo for Tears Of The Kingdom... and yeah, still holding out that they'll do an update for both of them. Especially with regards to Splatoon, because you could do another set of villagers for Pearl, Marina, (possibly) the Octolings, and Shiver, Frye and Big Man (whenever their amiibos get released)... but I'm mainly up for a Splatoon/Zelda update for Splatoon/Zelda furniture and clothing.
In all honesty, if I'm expecting an AC-related announcement in 2023, it's either this or the first tease of the next game in the series. In an ideal world, both. In a horrible world, neither.