Arlo just said that a spectator mode is a possibility he'd like to see, namely having a character that you spectate from the sides and can walk around, and use emotes while watching the race. It's not a bad gimmick as an extra way to experience the game.
I think having a campaign more advanced than Mission Mode in Mario Kart DS is a possibility. I don't really know if that counts as a gimmick, but it's a hook.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 40 million (was 60 million, then 67 million, then 57 million. then 48 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima