Foxconn Electronics and Pegatron have begun production of the PlayStation (PS) 4 Pro, a new Sony game console to be launched on November 10, and Foxconn has undertaken trial production of the NX, a new Nintendo games console, according to industry sources.
In addition to PS 4 Pro, Foxconn is the largest OEM for Nintendo NX, followed by Japan-based Misumi Electronics and Hosiden, the sources noted. Annual production of Nintendo NX is estimated at 9.5-10 million units, the sources said.
http://www.digitimes.com/news/a20160922PD207.html
Trial producations is usually done around 6 months before launch, full production usually starts around 3 months before launch. This basicly confirmes that NX is on schedule for March launhc.
Interesting, Emily Rogers 3 days ago said following:
-NX hardware is finalized. Don’t expect any drastic changes.
-NX is now entering a very early stage of production.
https://arcadegirl64.wordpress.com/2016/09/02/rumor-what-should-we-expect-from-the-final-nx-product/