According to a panel list from Star Wars Celebration, the next expansion could be named SWTOR: KOTET.
Redditor Sakowenteta spotted this on the Star Wars Celebration exhibitor list. It listed SWTOR as Star Wars the Old Republic KOTET. Could be a misspelling of KOTFE or the abbreviation of the next expansion.
You can view that page here: http://www.starwarscelebration.com/en/Exhibitors/1792379/EA-Star-Wars