WayForward has announced on their Twitter that Mighty Switch Force 2 is on sale in the United States for 30% in the Wii U and 3DS eShop. However, the discount will only last for a week. If you want to take advance of the reduced price, you only have until September 1st to do so. No word was given on if the discount would be occurring in other regions, so it seems that the sale is only for those in the US.
Thanks, N-Dub Nation