To my understanding NACS is now in the same standards track as CCS at the IEC standards body and is intended to replace some of the deliberation over a proposed "v3.0" CCS US standard upgrade that got stalled in various committees. There were some thoughts that the US needed a better connector than the under-adopted CCS1 (which is different from the better adopted EU/Asia CCS2 connector) and considered building a better connector from scratch for the US, but Tesla short-circuited that proposed committee effort by opening NACS directly to the standards body. It hasn't officially been standardized yet, but my understanding is that it will be sooner rather than later.