I think it's pretty clear the Ezra will be Snoke
Kanaan and Maul are playing tug of war the Ezra, Kanaan will get killed at the end, guilt over that, along with his parents being killed by the empire and his hate for the Sith (which is shown in the preview clips) will lead him to join Maul in an effort to get revenge on Vader and Palapatine...they will make their move too soon, Maul gets killed, Ezra maimed pretty bad, he goes into hiding while biding his time and starts the KOR