$599 price is suicide.
2018 is too late for new console, end of 2016. or more likely 2017. is far more realistic.
New Nintenod console will have similar power like PS4/XboxOne may be little stronger, it will heavy integration vith next handheld console, it will have BC vith Wii/Wii U games and controlers, price will probably be on PS4/XboxOne level of that date.