the two things i care the most about when playing arcade racing games is that it's fast and that drifting feels smooth. because it's kart racing, we already know it won't be very fast, so let's hope that at least it's not too slow or there's an option to increase speed
smooth drifting is hard to get right and many racing games fail at it. for drifting to feel smooth you shouldn't feel hard transition when entering drift mode and you should be able to easily drift around corner by tapping brake once. the best example of smooth drifting is 2010 Need For Speed: Hot Pursuit. you need to play it to feel it. other good examples are Burnout Revenge, Burnout 3, Ridge Racer 7 and the newest Hot Wheels Unleashed 2 also has relatively smooth drifting. on the other hand i absolutely hated drifting in Mario Kart 8, i didn't like the transition when entering drift mode and i had no idea how i was supposed to drift because i was either oversteering or slowing down too much
to make tracks more interesting it needs to have multiple paths and shortcuts. while Mario Kart 8 tracks are visually impressive, they are boring to drive because of how linear they are. the best example of complex tracks can be seen in Burnout Revenge. Hot Wheels Unleashed adds complexity in a different way by adding modules to the track, which create obstacles. this is also good because it can slow down players in the lead, giving a chance to players behind
giving help to people driving behind is always good. there's nothing fun to be constantly in the lead and there's nothing fun to drive behind the whole race because you made one mistake. the fun comes from close races. in Ridge Racer 7 you gain boost by driving behind other players, that's why you always see players overtaking each other instead of one player always being in the lead
even though developers probably already made decisions on how their kart racing will be, i hope they consider what i think