The listings for the Switch version of the game have now been listed for the 10th of May which is a couple of weeks after the original release. It has been pointed out that this only seems to be for Amazon listings in Europe, and that Amazon’s listing for the game in the US still states the 23rd of April, 2019 for the Switch version, suggesting that the delays could be limited to Europe.
Alternatively the listings could be wrong or haven’t been updated yet, but we’ll keep an eye out for more details. So far not much is known about the game other than the fact that it exists. There was a trailer released that confirmed at least two characters, but not much else. However it was stated that more details will be revealed on the 17th of January, 2019 which is in a couple of days, so hopefully we’ll have more to share with you then, including any potential delays.