Clone Wars Secrets: Mysteries of Mortis

The official site has a preview of Star Wars Insider Magazine #123:

"Launchpad: Upcoming episodes of The Clone Wars are previewed as the Jedi explore the mysteries of Mortis; Empire director Irvin Kershner remembered."

http://www.starwars.com/fans/media_news/insider_123/index.html

What are the mysteries of Mortis? What is Mortis? A person, planet, group/cult?

The Clone Wars is getting really interesting. Does this have something to do with the 'Dark Ahsoka' trailer? Look for more news and opinion as it develops.
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