Seems there have been some updates @ https://hismajestyspop.00...stapp.com/:

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29th July 2019: We have been given exclusive access to brand new information and access to master tapes which show previously unknown songs and recordings, as soon as we have our ISBN number we will open pre-order

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26th August 2019 - Front Cover and Back Cover artwork finalised

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21st September - typesetting nearly completed

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7th October - we are working with a major distributor

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17th November with an influx of new releases (and our goal to be as complete as possible) we have delayed things slightly to update and include the 1999 deluxe and also the I Feel 4 U Estate exclusive release

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Previous threads: https://prince.org/msg/7/460539 - https://prince.org/msg/7/459316

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Again: buyer beware.