Nikon owns Capture NX, especially the raw engine. Nik developed the interface for Nikon and added some functionality, notably control points. Nikon and Nik went their separate ways a couple of years ago; that's why CEP4 was not made available as a CNX plug-in. Nikon continues to issue updates, notably to add new camera bodies (and the 32-bit version). Google's acquisition of Nik has future ramifications for the various Nik software products.
What's the future of CNX? Summarizing (and grossly simplifying) other threads, it works well for many. For others of us, it has fallen behind the capabilities of other Raw converters and applications, notably Lightroom.
As a long-time user of CNX who converted to Lightroom. I'll say this:
If you are happy with your results using CNX, if you think CNX gives the best rendition of the in-camera settings, stey where you are.
If you like to "work" the image, perhaps to improve on the in-camera settings, then you may want to test other more powerful, more up-to-date converters.
And if you want an app that combines browsing, ranking, key wording, Raw conversion and editing, then Lightroom might interest you.
Jon Kandel A New York City Nikonian and Team Member Please visit my website and critique the images!