Update
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Saturday 28 October 2017 at 08:10
This finally happened:
https://www.pinballnews.com/site/2017/08/22/nucore-returns/
and in this thread:
https://pinside.com/pinball/forum/topic/nucore-returns#post-4038324
But sadily; they are still not offering the source code under GPL agreements.
Source: http://pinside.com/pinball/forum/topic/nucore-is-returning-2016/page/4#post-4043804