Diddy Kong has now been… unconfirmed for Mario Kart 8. We initially thought that the character would be included in the roster based on an article from Spain’s Official Nintendo Magazine, but it turns out this was a mistake. Director Juan Carlos Garcia confirmed on Twitter that ONM made an error.
That said, Diddy Kong isn’t necessarily ruled out all together. This just indicates that the magazine was inaccurate.
Thanks to Core Sublime for the tip.