Nintendo has released Mario Kart 8 Deluxe update 1.4.0 which adds new language options but also locks out players from playing with those running version 1.2.1 or earlier.

　　Once downloaded, patch 1.4.0 requires other players to be on version 1.3.0 (released on October 18 of this year) or higher to be able to engage in local or LAN play.

　　We’ve included the official release notes for update 1.4.0 down below.

　　On December 12, 2017, a new software update for Mario Kart 8 Deluxe became available for download. Please take a moment to download and install this update while your Nintendo Switch console is connected to the Internet

　　Version 1.4.0

　　Language support for Traditional Chinese, Simplified Chinese, and Korean has now been implemented.You can change languages in Settings on your console.An issue has been resolved that prevented background music from playing after you reach the finish line.When you download update data (Ver.1.4.0), you will no longer be able to engage in local play or LAN play with those still using Version 1.2.1 or earlier.Mario Kart 8 Deluxe is available now globally for the Nintendo Switch. Nintendo released the game back in April of this year and Dave loved it, as you can glean from his review's excerpt.

　　While Mario Kart 8 Deluxe isn’t revolutionary – in fact, it’s more of the same – it can’t be understated that what is here is actually a fantastic package. Admittedly, if you’ve played Mario Kart 8 and its DLC before, then there isn’t much here to draw you in, but this is one of the very best kart racers ever made, with one of the best selection of courses ever, and one of the best soundtracks. On top of all that, you can now play it on the train or bus without a single wire to tie you down. Stellar.