Eurogamer: Nintendo NX is a portable console with detachable controllers (It also connects to your TV, and runs cartridges)

[LMU Uncle Alfred]

"Due to the radical change in hardware design and internal technology, we've been told by one source that there are no plans for backwards compatibility."

This is a good thing if true. It means Nintendo will have to make sure there are a lot of high quality new titles on the NX. Wii Us I'm sure will be reduced in price soon given how little they sell.