Ok, so, because I play Infinity Blade because I love its story here's a nice theory as to what I think is going on so far:
1) The castle where the Worker is imprisoned used to be Ausar's home. I believe that this theory is corroborated by the statues below the tomb that opens in the presence of the Vile Set, and I am convinced that the male statue is of Ausar himself. The male statue is wearing the Vile Armor, but the female statue is the one presenting the Holy Ring. You can hear an argument between two men and a woman screaming while Siris is investigating the statues below the tomb. TEL immediately frets over the fact that Siris has unlocked a specifically tragic memory.
2) In Infinity Blade: Awakening, and through many of the conversations between other Deathless, it is apparent that Ausar was the one that Raidriar had slain at Koronth. It's also pretty apparent that the other Deathless were VERY happy about Ausar's "death" and failure to return after that initial death. The other Deathless hint that Ausar used to be a terrible person, and the personality quirks that Siris experiences in Awakening seem to point that Ausar was the worst of the Deathless. Hense the title: "Ausar The Vile".
3) I also believe that the "Vault of Tears" doesn't necessarily refer to the prison that holds The Worker of Secrets. I believe that it refers to the castle itself and the history that it holds. More specifically, the history between Ausar and the mysterious female portrayed by that statue.
4) The next content update claims that The Worker isn't the only one imprisoned in the castle. I doubt it's the woman, for I'm pretty sure that it'll be someone we have to do combat with. However, if the woman is another Deathless, it could be. Unlikely though.
5) As for the next content update: I have on idea where and when it could take place because it seems we've essentially looked in every nook of the castle. I am still hoping that one of the content updates will be an extension that lets us use Isa at some point to possibly free Siris. Although that'll probably be dealt with in Infinity Blade 3.
6) As for The Worker himself? I believe that Ausar locked him away because of The Infinity Blade. It's a weapon that can kill a Deathless, so it's possible that Ausar stole it away and locked up The Worker for creating something so dangerous.
Unanswered questions: Why did Ausar lock away his memories and vanish from the other Deathless? Did something tragic happen to that woman and did the despair from it consume Ausar so much that he sought to forget everything and give up his powers? Seems that way. Still, Raidriar came in to possession of the Infinity Blade somehow, so...was it taken from Ausar at Koronth? Why was the sword deactivated for so long?
So much that needs answering! Anyways, I've been going over this story for a while because I'm pretty much in love with the tale. Just had to write it out and discuss it to someone.
Tell me your own theories below...if you have any.