Comment by dev0p
Would have not surprised me if it's actually Mario Kart 8 2. (Technically that's already what Mario Kart 8 Deluxe is, so, actually, it would be Mario Kart 8 3).
I mean, at this point it makes little sense for them to start from scratch, releasing a newer game but with much less than the enormous amount of content provided by MK8D + DLC would seem like a very noticeable downgrade, so just revamping the old one would be a practical move, though I don't think fans would be happy with that.
MK8 was mostly flawless gameplay wise, how can it be improved? But at this point one has no choice but to trust Nintendo's ability to come up with surprises.
There are certainly some ways they can, I'd love to see a 100 man race or something crazy like that.
MK8 was also an iteration on MK7, with refinements to the handling, the addition of anti-gravity, and tweaks to items. It's certain there's going to be _some_ sort of mechanical shakeup.
Mario Kart sells like hotcakes; I doubt they'll have to do much to convince people to buy a new one, particularly folks who've played the old one for hundreds of hours.