I really hope you're right and the N64 Rainbow Road will be on there…in HD!!! If not that one, then I'd vote for the Wii Rainbow Road but that one probably isn't "old" enough to be included yet, and that one is "wild" enough that it might have too many similarities to the MK8 Rainbow Road (which I think we all can agree will be the most insane track the MK franchise has EVER seen!).
What I'm curious about is whether they'll go all-out and add "anti-gravity" sections on most/all of the Retro tracks as well. If they do (like they added some underwater and simple gliding sections in the MK7 Retro courses) then they'll probably be making their Retro track selections based on which courses will allow for that. And if that's the case…the SNES and Gameboy Advance MK tracks don't really lend themselves well to being remade with "anti-gravity" sections. So that would leave 64, GC, DS, Wii, and 3DS courses up for consideration.
Upcoming Games To Get
Definite: Kirby Star Allies (Switch), Mario Tennis Aces (Switch), Fire Emblem (Switch), Yoshi (Switch), Pokemon (Switch), Kingdom Hearts 3 (PS4), Monster Hunter World (PS4)
Considering: Fe (Switch), Donkey Kong Country Tropical Freeze (Switch), The World Ends With You (Switch), Ys VIII (Switch), Street Fighter V: Arcade Edition (PS4), Kingdom Hearts 2.8 Remix (PS4), The Last Guardian (PS4), Shadow of the Colossus HD (PS4), Anthem (PS4), Shenmue 3 (PS4), WiLD (PS4)







