Don't know if this has been announced anywhere or not through other channels, but Andy Serkis said in an interview recently that he's going to be doing an audiobook for the Silmarillion.

I've lived with the books because I've read the audiobook of The Lord of the Rings and The Hobbit as a charity thing for the NHS called Hobbitathon, which we did during the pandemic, and actually I'm about to do The Silmarillion, so the world of Tolkien has never left me.