Yesterday, Nintendo released a demo for WarioWare Gold for the European 3DS eShop, and a keen-eyed person spotted in the electronic manual that the game will allow players to use their own dubs with the cutscenes as well. [Thanks, PaulFish on Twitter!]
The game is fully voiced, and in the prologue movie players got a glimpse at the voice acting by Charles Martinet for Wario. Players can potentially use their own voice for characters in these movies, by saving recordings on the Nintendo 3DS SD Card, and selecting Studio in the Toy Room.
WarioWare Gold releases for Nintendo 3DS in Europe on July 27, 2018, Japan on August 2, and North America on August 3.