It seems like the games that Bandai Namco had planned to announce at E3 2019 have all just leaked a few days ahead of schedule. A security issue on their site made information for several unannounced games available and one of those games was Ni no Kuni: Wrath of the White Witch Remastered.
The remastered version is headed to the PlayStation 4 and PC and will feature improved graphics and performance. The Nintendo Switch version will be a direct port of the PlayStation 3 version it appears. It is slated to launch on all those platforms Fall 2019.