Considering that this has been a little longer than normal between mainline animal crossing games I think the animal crossing game for switch 2 is at the top of the list currently, it just hasn't been announced yet. Calling it now we will likely have a new ac game release in mid-late November either 2026 or 2027 almost every ac game both mainline and side has been released in november or early december in some country with NH and plaza(which failed horribly) being the only exceptions. Considering that it is one ac mainline game per console I seriously doubt it will be later than that especially after NH's massive success. Wouldn't be surprised if they finally remake/remaster the original though. (no new leaf doesnt count it just got upgraded to match the upgraded ds to make more money)
Also wait Pokemon colleoseum/XD got WHAT?! ABOUT TIME