They haven't claimed that it will be a fully unified platform, which is what people are getting at. I'm sure they're heading in that direction, I don't think they're going to have handheld devices and home console devices playing all (or even most) of the same games though (although they will have a common library.) Some games will probably be exclusive to the console device and some to the handheld, and we don't know to what extent these consoles will share them. I think Nintendo is going to take a gradual approach. I can see Nintendo announcing their handheld version of the platform in 2016, and maybe even releasing it then, and most games will probably translate to their home console form-factor, but I can't see a home-console form-factor released in 2016. There is just too much hardware R&D to manage and it would take thunder from the Wii U. 

This is as much as Nintendo really has said on the matter:

http://www.gamespot.com/articles/nintendo-s-next-console-and-mobile-will-be-like-brothers/1100-6417496/

Finally, Iwata said he remains unsure if the form factor of its next platforms will be integrated to establish some kind of hybrid system. Instead, he said the opposite might be true; that the number of form factors could increase in the way that multiple devices can run iOS and Android. This will all depend on consumer demand, he said.

"The point is, Nintendo platforms should be like those two examples," Iwata said, referencing iOS and Android. "Whether we will ultimately need just one device will be determined by what consumers demand in the future, and that is not something we know at the moment. However, we are hoping to change and correct the situation in which we develop games for different platforms individually and sometimes disappoint consumers with game shortages as we attempt to move from one platform to another, and we believe that we will be able to deliver tangible results in the future."

Mobile's growth rate is still in double digits, but slowing down considerably. I think mobile gaming will enter it's plateau phase.

Nobody said a 3DS successor can't or won't come next year. 

....

3DS sales are slowing down, yes, but they're still good. If Nintendo keeps supporting it and if the New 3DS is a success in the west, they can easily wait until 2017 to release a successor. They want to get all the profit they can from the 3DS, which is wise.

Iwata shouldn't have had to say a word. My library is already packed full of so many quiality games. And whatever comes out from the E3 after XBCX is just bonus for the best console this generation. I couldn't be happier with it.

I'm talking in terms of sales numbers.  For all we know nintendo will survive as a toy company in future.  definitely keeping their options open.

Yeah I best wait and see how the new 3DS does first.  When is the eu and usa release?

I think toys and other merchandising actually are going to be a central part of their future. Gaming will become just one pillar (Fusion of handheld + home), the new second pillar will be toys/merchandising and then you'll have Quality Of Life products like the sleep sensor as the third part of their business. 

It would be good if Nintendo didn't have to jump to a new console and just wait the usual 5 years, but that doesn't seem to be the case.

Nintendo's biggest sellers for the home console are already out and Zelda is the last system seller they have left.
Also, despite DK, MK 8 and Smash being released in 2014 the overall sales for the year were what 500k more than 2013, which was a dysmal year.

Wii U hasn't got the diversity, 3rd party software, room for a price cut while maintaining a profit, to keep the console afloat 5 years, when GC barely achieved that with a way better library of games, lower price and enough money being made on the system.
Nintendo will be forced to do something big and they better do it sooner rather than later or their future in the home console market will be at risk. Investors are not going to like seeing Wii U losing revenue alongside 3DS.