It is probably 3DS succesor. In 2016 it will be end of 3ds generation.
also there is few hints already:
1) Sharp FreeForm Screens for nintendo in 2016
http://www.theverge.com/2014/12/16/7406585/nintendo-said-to-use-sharp-free-form-displays
2.) New Amd Apu for nintendo in 2016
http://wiiudaily.com/2014/12/amd-hints-at-new-processor-architecture-for-game-console-in-2016/
3) Amd also plan to release new mobile architecture in 2016 - Project Skybridge (apu with AMD x86 or AMD ARM Cores)and Amd Zen Apu's (new mobile apu, probably with HBM memory on die)
AMD Skybridge (2016) http://www.pcworld.com/article/2150775/amd-announces-skybridge-chips-to-bring-together-x86-and-arm.html
AMD Zen (2016) http://wccftech.com/amd-zen-architecture-asus/
Probably 1st presentation at E3 2016, Launch on december 2016 before holidays.
