Unfortunately Animal Crossing was not on the list of Nintendo Switch games that was officially revealed. So Animal Crossing will not be available on the console or come to it later.
Animal Crossing mobile interact with Switch
At the Nintendo earnings report on April 2016, Tatsumi Kimishima, the president of Nintendo currently, mentioned that Nintendo planned to get Animal Crossing mobile to interact with Animal Crossing available on video game consoles in some ways. Check the link below for the information.