Already known, Mario Kart 8 shall be released with a second DLC with the subject of Animal Crossing. Now the date for the additional content is fixed and also you will be donated a free update, with which you receive the 200cc mode.
With the new DLC you will receive new contents, which are reminiscent of the Animal Crossing series, including eight tracks, two cups, two new vehicles, Mega Man, Pac Man, Sonic, Toad, Wario, Villager, Rosalina and Bowser as playable characters. This will be released on 23rd April 2015 at a price of 7.99 dollars.
In addition, Nintendo has announced in the latest direct-sequence that you will receive the 200cc mode by an update on the same day. Also planned is an extended Amiibo support for the game, with which you can you unlock nine new costumes.
For both subjects, the Japanese company has released trailer, which you can find below: