Supreme Leader Snoke’s true identity will not be fully revealed in Star Wars: The Last Jedi. His is a mystery that will be unspooled over the course of the next two chapters in the final Skywalker saga.
In true Star Wars canon, it’s well known that Emperor Palpatine was fascinated, perhaps even consumed, by the Unknown Regions.
The theory goes onto say that it makes since for Snoke’s species to be ‘unknown’ since he is from the Unknown Regions.
Snoke is just one of the many mysteries yet unsolved as we head into The Last Jedi. It may be tied to Rey’s true parentage.