"One of the most important things to note about the NX is that it’s not a gaming platform in the traditional sense of the word. Rather, NX is the platform on which all of Nintendo’s future games will run, regardless of the hardware used to run them."
http://bgr.com/2015/08/18/nintendo-nx/
So, similar architecture between console and handhelds plus I'm assuming eShop legacy ownership of games. Developers will like the first and the second will help Nintendo's digital sales. I've heard very little in terms of hardware and think that we won't see NX compatabilty until 2017 at the earliest.
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