During a press conference in Japan Nintendo boss Satoru Iwata mentioned new hardware, codenamed NX.
Later they confirmed their announcement:
As proof that Nintendo maintains strong enthusiasm for the dedicated game system business, let me confirm that Nintendo is currently developing a dedicated game platform with a brand-new concept under the development codename "NX". It is too early to elaborate on the details of this project, but we hope to share more information with you next year.
What is interesting to note is the "brand-new concept" statement which considering consoles like the Wii, which were new concepts leaves a very broad and awesome outline of what is to come!
Will we see a resurgence of Nintendo?