Tolkien's Legendarium - enough already or would you like more?

I can't see what else could be published but I feel Harper Collins always seem to come up with something? Maybe it's got to the point where absolutely everything will have been published.

The Hobbit (first three editions are all different)

LOTR (first two editions are different)

The above also available in annotated, illustrated, author illustrated and revised editions. Also in boxset edition with Readers Companion.

Bilbo's last song

The Adventures of Tom Bombadil

The Silmarillion

Unfinished Tales

History of Middle Earth (12 vols)

History of The Hobbit (2 vols)

The Nature of Middle Eartb

The Children of Hurin

The Fall of Gondolin

Beren & Luthien

The Fall of Numenor (compilation of previously published texts)

Letters

Letters (revised edition with more letters, upcoming in 2025)

Is there anything else out there that Harper Collins could publish to generate more money for the estate?