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A LinkedIn profile for a lead designer at Bandai Namco Studios Singapore was found by YouTuber Doctre81, showing that Ridge Racer 8 may possibly be in development exclusively for Nintendo Switch.
The same profile also shows an ‘unannounced IP’ which is a First Person Shooter/Adventure game, which is also Nintendo Switch exclusive. While this does not specifically point at Metroid Prime 4 on its own, later in the profile it is written that he created many design concepts for Nintendo.