The game's been available since 2019 and Nintendo is still providing it with regular content updates. At the end of last year, the game got the New Year Tour - adding in Bowser's Castle from Mario Kart 7, and in the next update it'll be adding Singapore Speedway.
This is a new track part of the Singapore Tour which also marks the debut of vacation Luigi:
Singapore Speedway will join various other global tracks like Sydney Speedway, Los Angeles Laps, Vancouver Verlocity, the London Loop and Tokyo Blur.
Are you still playing Mario Kart Tour on mobile? Will you be checking out this next event? Comment below.