I hadn't heard anything about a new game coming out for the switch. I will have to check that out.
Haven't heard anything about ac for the switch either, just assumed a new mainstream game would be for it.
There's the mobile ac possibly coming out (the one they put back to sometime ??; which presumably would tie in with a new Switch ac game. (or maybe to acnl).
I checked, games on the switch do save to the unit not the game cart. Seen it said that with a pay for online service, we might get the ability to save to the cloud. But its guessing, not fact.