I personally really hope this is true.
I love handhelds (I own multiple DS's a PSP and a Vita).
I'd love to get a Monster Hunter 5 that is finally in HD again, and I can put on the TV. Mainline pokemon games could be played on TV (with a huge power boost since pokemon games have always been handheld focused).
As long as the messaging s right I could see this being a hit. Who honestly expected them to combat the PS4 and Xbone at their own game by just throwing out a powerful console and sell it at a loss and hope they can did into those install bases? This is probably a smarter idea than that, since the DS/3DS line is one of nintendo's most successful lines.
The main problem will be the 3rd party support since if this is to be believed, the NX would be too underpowered to port most current gen multiplat games.