From what I gathered, Tyber Zann left the Eclipse because it was too big a target, AND because he had gained the billions and billions of credits needed to reestablish his crimeworld.
Silri used the sith artifact (sith holocron), and followed the star map to that planet where the vault with billions of supersoldiers (i assume), frozen in carbonite.
My guess is that the sequel will be about stopping Silri who controls an army of Sith with the Rebels and the Corrupted Side.
You see, I'm actually a deathly sith lord. But since my ressurection from the body of Jaden Korr, I've been pretty busy with growing up. It can be irritating sometimes having to re-live life, but it'll be worth it when I rule the universe again as the almighty Dark Lord of the Sith.