Shinya Takahashi recently revealed in an interview that more content was coming to Mario Kart 8 Deluxe, following a recent update that added a control scheme that supported the Nintendo Labo bike. This led to speculation that paid DLC was coming to the game in the future, which would belittle the "Deluxe" part of the title.
Mario Kart 8 Deluxe has now received an update that adds some free content to the game, in the form of a new costume for Link that is based on his The Legend of Zelda: Breath of the Wild gear, and a new vehicle that is based on the Master Cycle Zero, which first became available in the DLC for Breath of the Wild.
Once the latest update is downloaded for Mario Kart 8 Deluxe, you will be given the opportunity to select between the regular version of Link and the Breath of the Wild version whenever you select the character, in a similar manner to selecting a costume when playing as a Mii.
The Breath of the Wild version of Link will now pull out the weapons from that game when performing tricks.
Now that the Breath of the Wild update is out for Mario Kart 8 Deluxe, we are left wondering whether this is paving the way for more content, or if it was just an extra bonus for fans of the game. Mario Kart 8 Deluxe is the 2nd best-selling game on the Nintendo Switch (after Super Mario Odyssey) and has outsold both The Legend of Zelda: Breath of the Wild and Mario Kart 8, which was the best-selling game on the Wii U.
It's possible that this level of financial success surprised even Nintendo, and they decided to throw in some new free content as a thank you to the fans.
There is still the possibility that paid DLC is coming to the game, which may be Nintendo's way of keeping interest in Mario Kart 8 Deluxe without having to develop a new game in the series for the Nintendo Switch.
The new Breath of the Wild items is part of a free update for Mario Kart 8 Deluxe that is available right now.