Think it's probably a given that Ludwig Goransson will be working on Filoni's film.

But with Williams pretty much retired and over 90 I don't think he'll be doing the Rey movie. Giannoco perhaps? His Rogue One of course had the Star Wars 'feel' to it but also kind of distinct at the same time.

Mangold frequently works with Marco Beltrami, but most of Beltrami's work seems to be for horror movies or darker superhero movies like Logan, Venom and the 2015 Fantastic Four. Then again we don't know what tone Mangold will be taking for his "Dawn of the Jedi" film.....