So it means that they are going to bring him back, since they removed that.
You're both wrong actually. A "cowl" (the relic was Revan's Cowl
) is not a mask, calling it a cloak would be more accurate. Example: Batman wears a cowl with a cloak.
And they took the relics out because they were bugged to Chaos and back - 2/3 didn't work.
As for Revan being dead.... yeah there are 2 more Operations datamined (Scum & Villainy, The Dread Masters). Presumably the Revan storyline will resume with the 3rd upcoming Operation. Or Chapter 5 of the main story.