https://www.1ofwiisdom.com/2014/08/mario-kart-8-dlc-link-acnl-new-courses.html
^You can take this link to see the tutorial on how to get the DLC^
Why the update? DLC Pack 1 hits Thursday, November 13th, 2014!
Here is a recap:
New Characters:
-Tanooki Mario
-Cat Peach
-Link
New Karts:
-B-Dasher
-Blue Falcon
-Tanooki Kart
-Master Cycle
2 New Cups featuring 8 New Tracks
Egg Cup
-Yoshi Circuit (GameCube)
Excitebike Arena (New)
Dragon Driftway (New)
Mute City (New)
Triforce Cup
Wario's Goldmine (Wii)
Rainbow Road (SNES)
Ice Ice Outpost (New)
Hyrule Circuit (New)