Is there anything wrong with a Light/Void/Space theme, btw?
It seems like a natural expansion setting that has been set up at least since 7.3, which, as a reminder, the community loved.
Sargeras was terrified of the Void Lords.
Alleria and Turalyon, who returned from Argus, now lead the Alliance.
Locus-Walker, first met in Mac'aree, remains a major player aligned with Alleria's Ren'dorei. In Mac'aree, a band of evil Etherals worshippers of the Void is discovered.
Xal'atath's whereabouts are still unknown.
It seems like a natural setting for an expansion.