Let me just say -- both cases are STUPID.
1. It is always poor storytelling when you pronounce a character dead, and then resurrect him. It's cheap and offensive to the audience. They did this stupid stuff with Palpatine and his numerous clones, and I'm happy those stories are finally getting retconned. Then they did the same with Darth Maul in that strange CGI cartoon. And finally, they did the same thing here in TOR, making you believe that you have killed the Emperor only to find out that it wasn't really him.
2. For two years now, the fans have been grasping for straws with that disappearance in the flash of light, hoping that maybe Revan teleported. I'm amazed at how persistent that theory has become. There is no such thing as teleportation in SW universe. He quoted the DYING words of Malak. And finally, it is common for a dying Jedi to disappear in the flash of light. This is the same straw grasping as the Indoctrination Theory with ME3's ending. And I've been telling people to make peace with Revan's lousy death and move on.
3. But now, if your words are true, Disturbed, and he is indeed to return, I will not be surprised one bit. I mean Darth Maul was cut in two, for crying out loud, and they returned him for no good reason, so why not return Revan? And It will be fan service because they now realized that they did not do the character justice. I just have no idea how they would go about fixing this mess of a story, but let's wait and see.
That all of course, if your words are true, of which I'm still very skeptical.