If you find it please pass it on as I had an inspection 2 weeks ago and there was no mention of any changes

Yes for plant and machinery, but still in development, and have been for 18 months, haven't heard that they have some consultative papers available yet. Haven't heard anything as far as changes to height regs/COP

MBIE did some consultation on this about 18 months ago, but there has been no real mention of it since.
https://www.mbie.govt.nz/have-your-say/implementing-the-health-and-safety-at-work-act-better-regulation-plant-structures-and-heights/

My honest opinion is it is more to bring all the H&S regulations under the HSWA title rather than still having the '95 regs and the PECPR sitting with an HSE title.

https://www.mbie.govt.nz/have-your-say/implementing-the-health-and-safety-at-work-act-better-regulation-plant-structures-and-heights/ — MattD2

some light reading

Not sure about plant and machinery but for height:-

As of last year, there is now a new standard for Rope Access - AS/NZS ISO 22846.1:2020 and AS/NZS ISO 22846.2:2020. Part 2 is advertised by standards as a COP, but this isn't freely available to access - you have to pay - and most business wouldn't operate rope access systems for work at height as it is not necessary. Though, this could be the start of change for working at height activities and may soon lead to the current AS/NZS 1891.4:2009 being superseded or phased out.

All the working at height NZQA unit standards were due for review December 2019, however as nothing has changed here, perhaps they're waiting to see what comes of these new regulations and/or COP's.

Food for thought.