As you all know rumors have been going about that Darth Malgus survived his fall in The False Emperor. While it seems it is true. One of the items on the Cartel Market is a Darth Malgus Holostatue, when interacted with he will train Imperial Players. Has he joined with the Empire again?
SWTOR Head Writer Hall Hood says he's dead.
The characters in the game say he's dead.
The characters in SWTOR: Annihilation say he's dead.