Those who purchased a season pack receive store credits at eShop.
Warner Bros. have decided not to release the upcoming story DLC for Batman: Arkham Origins on Wii U. As a result Nintendo are now sending refunds to those who purchased the season pass as reported by GoNintendo.
"Thanks so much for your support of Batman: Arkham Origins on Wii U.
We are contacting you today because you purchased the Batman: Arkham Origins Season Pass for Wii U. We hope you've been enjoying the content that has been delivered thus far. Based on demand for Downloadable Content on the system, Warner Bros. Interactive Entertainment has made the decision to remove its offering of the upcoming new story campaign for Wii U. As a result, we will be crediting the entire $19.99+tax cost of the Season Pass back to your Nintendo eShop account. You will still be able to enjoy the content already released thus far.
We apologize for any inconvenience this may cause and thank you for your support of the game.
Nintendo of America Inc."
With Batman: Arkham Origins underperforming on the whole compared to its predecessors it is perhaps not that surprising that Warner decided to cut some costs - and clearly it would seem that the interest in buying DLC for the game was the reason.