Kimishima: NX neither a WiiU nor a 3DS successor.

[Proxy-Pie]

According to IGN's article which includes NeoGAF's translations of Tatsumi Kimishima's comments, the NX "is neither the successor to the Wii U nor to the 3DS" and that it's a "new way of playing games", and he thinks that it'll have a larger impact than the WiiU and not entirely replace it.

sauce: http://www.ign.com/articles/2016/05/16/nintendo-president-nx-is-not-the-successor-to-the-wii-u-nor-to-the-3ds