Previously code-named NX, now named the Nintendo Switch, the device looks like a tablet computer with controllers that attach to its sides.
The device was revealed in a short "teaser" video posted on YouTube.
One analyst said the device could be Nintendo's "last shot" at selling a home console.
"The Wii U was a car crash, basically," said Paul Jackson of the Ovum consultancy.
"They fudged the communication and confused everybody with the controller and what the screen was for.