Seems like Yoko Shimomura has composed a new 45-minute original piece of orchestral music called "Merregnon: Land of Silence", which will premiere in an online stream on Sep 10, 2021:
https://www.konserthuset.se/en/merregnon
The piece is arranged by Jonne Valtonen and produced by Thomas Böcker, who are maybe most known for
Symphonic Fantasies and
Final Symphony.