Compile Heart will release Neptunia x SENRAN KAGURA: Ninja Wars to the Nintendo Switch on March 17, 2022 with additional features such as:
"Extremely Hard Mode" with tougher enemies
"Mushy Mushy Mode"
8 costumes previously released as DLC
Additional sub events
Source: http://ryokutya2089.com/archives/49556
UPDATE 12/16:
IFI has announced that the game is coming to Steam in Spring 2022 alongside the Switch port:
https://twitter.com/IdeaFactoryIntl/status/1471541281700466688
UPDATE 2/4:
Localized Switch port release dates announced, slated for April 19, 2022 in NA and April 22, 2022 in EU: