They didn’t specify the platform but they did previously confirm that they are developing on the Nintendo Switch.
☆ NintendObs Weekly – Monday, December 19, 2016 – Sunday, December 25, 2016.
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…
…Wanna play? Buy a Wii U.
Well… not anymore. Anyway, click on SteamWorld Dig 2 for everything you need to know about the game. 😀