SteamWorld Heist is targeting a February/March 2015 release. The game will be available on 3DS, Wii U, PC/Mac/Linux, PS4/Vita and Xbox One. According to developers Image & Form, SteamWorld Heist is not necessarily gonna be a sequel but more of a spin-off to the popular SteamWorld Dig. It will be a game of survival in a turn based space adventure.
Source: Nintendolife.com