According to the site, Iwata stated that the “Wii U is not over yet. I want to continue to build on playing on people’s high expectations [for the system].”
He also stated that there are still multiple unannounced titles for the Wii U coming up. While they will most likely be revealed during E3 2015, the site does not state the exact time or date. Still, it will be interesting to see what other games Nintendo will have in store for Wii U owners.