Image & Form has announced the Americas, Europe, Australia and New Zealand release for SteamWorld Heist will be December 10th for $19.99 / €19.99 / £14.99.

BUT, as a gift to the 3DS community Image & Form will offer SteamWorld Heist at a discounted price of $16.99 / €16.99 / £11.99 from launch until December 31st.

Source