My King Sombra Fan Theory Has Been Proven TrueFor those who do not remember, I made a fan theory in December of 2016 regarding comments about King Sombra being dead and not returning to the show to be false.
https://www.deviantart.com/cloudmistdragon/art/King-Sombra-is-Not-Dead-MLP-FiM-Fan-Theory-652475278
This theory has been proven to be true, as King Sombra has officially appeared in the show's Season 9 trailer.
https://www.youtube.com/watch?v=oerhTEh8y_4
You're welcome.