It won't be anything Nintendo, New 3DS hasn't even launched in the west and the Wii U would have only been out for 4 years by the end of 2016.
IMO the ARM system is probably Sony's next handheld, Vita would have had 5 years on the market by 2016.
Although introduce can mean that it's when the platform is put into production, so the announcement could come around that time.
Still from a cost POV waiting a bit longer to go into production is the smartest thing for all of these companies as costs would reduce.
No way Nintendo will launch a new home console a full 2 years before the competition are likely to release.
Either it's that or some new player will enter one of these markets, maybe Microsoft are planning a mobile Xbox platform finally and they will announce when that's ready or it could be an Apple, Samsung or even a new Ouya system.
