Did you hear? After 5 years, Nintendo actually decided to add an update to Tomodachi Life! Yesterday, Nintendo gave an announcement that they would update the game, and the first 1000 people to see the announcement also got an exclusive Mii. By now, it's probably too late to get the exclusive Mii.
By the way, this is April Fools and the actual announcement is that I added a Rick Astley Mii to my game.