Over on the game's official message board, 2K Elizabeth revealed this nice bit of information a couple of hours ago. She even took the time to explain specifically why the content packs didn't hit.
== TEASER ==In short, Protector Trials was too buggy to release, but 2K has since puzzled out a way to eliminate bugs in the code that kept the studio from releasing it and a game wide patch. As far as Minerva's Den is concerned, well, the studio listened to user complaints and decided to reallocate resources to a PC version, which already existed in a working form before the team was pulled to do other stuff.
A lot of critics spit big game about Minerva's Den. [Editor's Note: It is in fact one fantastic add-on. Buy it.] I've heard more than once that the DLC is more satisfying that the actual game, which just sounds weird [but true -ed.]. But, hey, now PC owners will get to see for themselves. You're happy, right? You should be!