Wow! I am legitimately surprised Nintendo is doing paid DLC for any game. Fortunately they are doing it for Mario Kart 8 and what a great deal it will be. You can buy each pack separately for 8 bucks each or both packs for 12. As of now it looks as if this is what is to be expected…
Mario Kart 8 Pack 1 – Releases: November 2014
Pack 1 includes:
3 Characters: Tanooki Mario, Cat Peach, Link
Mario Kart 8 Pack 2 – Releases: May 2015
Pack 2 includes:
3 Characters: Villager, Isabelle, Dry Bowser
As a bonus for purchasing both packs, as a bundle or separately, you can get eight different-colored Yoshis and eight different colored Shy Guys that can be used right away.