The graphics look decent enough but that's about it.
I'm still waiting for Nintendo to announce Mario Kart 9 for the Switch. I can't imagine they'll go an entire console generation with only an enhanced port of the Wii U entry available.
They never make more than one Mario Kart game per console. When you've been a loyal Nintendo player since the mid-90's, you pick up on some very obvious patterns.
Never more than 1 Mario Kart. The Switch game being MK8 "Deluxe" does NOT matter.
Never more than 2 3D Zelda games, ports excepted. N64 had two. GCN had two. Wii had two. WiiU had Breath and the TP+WW ports. Switch has Breath and likely at least one more before we call it quits, and it seems people want an "improved" Breath sequel, so yeah. Could be a 2021 title!
Never more than 1 Smash Bros. game. Even now, people look at Ultimate as "For WiiU/3DS done right", and there is almost no reason to go back to previous Smash titles beyond the SSE of Brawl(Even then I'd argue only for the cutscenes, so barely even that) and the "particular" gameplay of Melee. Oh, I guess barring nostalgia also, but that shouldn't be a factor here.
Regarding Pokemon games, there is never more than two new "sets" of games. GBA had only one set and one remake set. GameBoy had two sets. DS had two new sets and one remake set. 3DS had two new sets and one remake set. Switch currently has one remake set of sorts, and will have the first new set this holiday. Likely we'll get one more new set and maybe another remake set before the end of the console's lifespan. Personally, I'm waiting on a proper hedgehog pokemon. =P
3D Mario games are ALSO usually only 1 per system. Galaxy broke the trend in a way with Galaxy 2, but that has been the only exception thus far, and there was a good reason behind the decision.
Other series like Mario Party, Star Fox, Metroid, etc tend to be more inconsistent with their release patterns. There's always at least one Kirby game on each Nintendo console, but GameCube only had one kinda okay spin-off, so again, kinda shaky. Donkey Kong has also had a shaky history, but there has been at least one platforming DK game on each console I'm pretty sure. If there's something I'm missing, feel free to let me know.
tl;dr Mario Kart 9 AIN'T HAPPENIN' until Switch-U, but I will eat crow if it somehow does happen on Switch and Nintendo breaks their established patterns again.