On the Wii, eShop sales never happened. On the DSi, eShop sales never happened. On the 3DS, well, it was the same. Those digital storefronts were locked down with the exception of Club Nintendo offers.
Out of nowhere and also out of the darkness come fast discounts of Wii U eShop indie titles. See, it can be done.
Little Inferno, Trine 2, and Chasing Aurora have had their prices slashed up to half off. Europe gains Puddle in this deal.
There were no press releases for the sale, but each game has its own sale expiration date listed within the eShop. Nintendo did post a message on their official site making it official elsewhere other than the digital storefont.