I hope that Andy Skurow doesn't mind my putting his recent Facebook post here [I've not included the video clip from 6 years ago]:

"Six years ago today we announced Diana Ross & The Supremes: Expanded Editions - Expanded Edition of The Supremes Sing Holland Dozier Holland! We loved this collection, and we know you all did too. Soon we will announce a new Expanded Edition! This time around it’s neither Diana Ross nor The Supremes, but we think it will be something you’ll love. Anyone want to guess what it is? Possibly something on your wish list? You will have to wait for an announcement in the coming months. We will neither confirm nor deny. There will be NO HINTS. That said, all guesses are welcome! ............. See you all soon!"