I've just found this on HC's UK site - also listed on Amazon UK - with a release date of 14th August.
Can't see any posts about it on this board so am wondering if it's only just been announced (or you've previously discussed it to death and I'm both late and slow)?
Also wondering if the three volumes are likely to simply be reprints of the previous editions in this hardcover/matte jacket format?

The Great Tales of Middle-earth (Box set)

You can see our thread about it here, I think we covered your questions.

https://www.tolkienguide.com/modules/n ... t_id=60775#forumpost60775

You did; comprehensively so! Many thanks!