MCV UK has revealed that Disgaea 5: Complete will release in Europe on May 26 for Nintendo Switch. The North American date will likely be within the same week, and should be revealed later today at NIS America's annual press event.
Update: Disgaea 5 Complete will release on May 23 in North America
This new release includes all DLC from the original PlayStation 4 release. This includes 8 bonus scenarios, 4 characters from previous Disgaea games, and 3 new character classes.