During a shareholders meeting, Nintendo explained it's revealing so little about its next-generation NX console is because the firm is afraid its competitors will steal its ideas. The Japanese gaming firm doesn't want to reveal its hand too early and plans to make a big announcement sometime next year:
During a shareholders meeting today, Iwata responded to a question regarding the transition between Wii U and 3DS and the forthcoming NX:
We can't talk about the NX. If we do, competitors may take our ideas and customers won't be surprised. This would not be beneficial for the company or its shareholders. The NX is new hardware, and will start from 0. However, the 3DS and Wii U have install bases. Immediately cutting off software for previous hardware upon the release of a new machine is inefficient. We will continue making 3DS and Wii software while preparing for the NX. We are prioritizing satisfying customers who purchased the Wii U.