As part of a short video recently shared on the official Nintendo of America Twitter account, head of software development Shinya Takahashi confirmed that Mario Kart 8 Deluxe isn't done getting software updates. At least, not quite yet.
— Nintendo of America (@NintendoAmerica) July 12, 2018
“Hello, everyone. I am Shinya Takahashi from Nintendo.
Now you are able to play Mario Kart 8 Deluxe using the Nintendo Labo Toy-Con Motorbike. So whether you’ve been using bikes in Mario Kart 8 Deluxe or not, please try playing with the Nintendo Labo Toy-Con Motorbike.
There will be further updates for Mario Kart 8 Deluxe, so please look forward to it.”
Mario Kart 8 Deluxe hasn't been getting regular updates in 2018, with this year's only update dropping in mid-June adding Labo Motorbike support to the game. However, that was a really nice little update that added something fun and substantial to the game. It seems like Nintendo is being thoughtful about how it updates Mario Kart 8 Deluxe, and if there's more to come, I won't be saying no to that.