The four Champions from Breath of the Wild will be arriving in amiibo form on November 10.
The figures unlock gear and weapons within Breath of the Wild. They also each unlock rather awesome looking armour based on their respective divine beasts too.
The release date and functionality was revealed in the Nintendo Direct that aired earlier today, though the Direct also stated that more functionality will be revealed at a later date.
— Nintendo of America (@NintendoAmerica) September 13, 2017