Amazon UK is listing several placeholders for Switch – though it’s unclear how long they’ve been present on the retailer’s website.
A quick search of the placeholders can be found here. Some are a bit questionable, as a couple have the Pokemon logo while another features the Smash Bros. Ultimate boxart.
Some screenshots below:
(=^・ω・^=) Kuroneko S2 - Ore no Imouto - Steam, MyAnimeList and Twitter - PSN: Gustavo_Valim - Switch FC: 6390-8693-0129 (=^・ω・^=)