Nintendo has not revealed many details about Splatoon 2 and during the print tests, it was possible to test only the multiplayer segment, however the site Broken Joysticks confirms the presence of the single player mode.
An editor of Broken Joysticks would have received the news from an unspecified PR of Nintendo, according to reports, the campaign of Splatoon 2 is set two years after the events depicted in the previous installment of the series.
Also the first episode indeed proposed one Story Mode, but in this case we assume a single player segment even more full of activities.
This is not a simple port, as emerged in the last hours by a leak of pre-event, but an actual sequel to the multiplayer shooting game released for the Wii U. New weapons and new arenas appear between the guaranteed functionality not seen before.
You can play in portable mode and home mode, and similarly the game will support Joy-Con for the motion controls as well as with the classic pro controller.
Splatoon 2 will be released in the summer exclusively on Nintendo Switch.