Nintendo shared a few details on Animal Crossing: New Horizons' multiplayer component during their Nintendo Direct and Treehouse Live segments, but it turns out there's some more info to go over. IGN managed to grab these multiplayer-specific tidbits from Nintendo.
- you can’t set up a tent on a friend’s island.
- you can make up to eight playable accounts on one Switch and they will be able to live on the same island
- you cannot have multiple islands
- the Switch Online app should be compatible with Animal Crossing: New Horizons