It's safe to say that Nintendo won't launch new hardware this year.

[Darwinianevolution]

I don't see why a 2016 release would be so bad.

Power differences with the competition? Nintendo wouldn't have used that extra time to add power anyway, not without an absolute guarantee that the device would sell and 3rd parties would support it (and that guarantee still isn't clear).

Cutting the lifespam of the WiiU/3DS? Both systems are in clear decline as it is, if anything an early release will avoid an last year software drought.

Lack of games? If the rumours are true, Nintendo is unifying their libraries, that would mean two times the games playable on each piece (Handheld or home console), and avoid redundant developements, like MarioKart HH/HC. Besides, if the NX has been in developement since 2014, we could think they've been preparing games for it since that year, so we have between 2-3 years of unheard of projects in the best case scenario.

Lack of adds? Better market your product extensively in a short timespam than a longer campaign. Attention spam of the market can be pretty sho... hey look, Pokemon Sun/Moon!