The long rumored Pikmin 4 seems to have been renamed Pikmin World according to a recent listing on Dutch site InterToys.
The release date is listed for March 24th 2017 which is clearly not happening but the idea of a new Pikmin game is plausible. Among the rumored Switch titles set to be released this year, Pikmin 4 was one of them. Multiple sources confirmed it is happening and will most likely be revealed at E3.
Like with all rumors it’s best to take this with a pinch of salt.