HORI releasing Link and Toad Mario Kart 8 wheels
Both accessories are officially licensed by Nintendo and act as attachments for the Wii Remote. They come equipped with a trigger button on the underside of the attachment to make the B button easily accessible. Additionally, they are optimized/designed for use with Mario Kart 8.
A few photos of the Link and Toad Mario Kart 8 wheels can be found in the gallery below.