Nintendo has released a statement to Gamespot confirming that the Mario Kart 8 Deluxe Switch bundle is indeed real! But it's exclusive to Russia for now.
GameXplain Video:
https://www.youtube.com/watch?v=yoBn4Uhegr8
(=^・ω・^=) Kuroneko S2 - Ore no Imouto - Steam, MyAnimeList and Twitter - PSN: Gustavo_Valim - Switch FC: 6390-8693-0129 (=^・ω・^=)