Nintendo have officially announced the release date for their next console, the NX. So far very little information has been made available about the upcoming console, and little else was revealed with the announcement.
The only pieces of information available are some patent images of controllers, (very likely) fake images purporting to show hardware and a statement from the Nintendo president that the new console will not be the next Wii or Wii U.
This article from The Verge goes into detail about what we know so far and is definitely worth a look. Hopefully we will be getting more details in the not too distant future.