Once you finish the narrative in TTK (story,raid etc) you will unlock a mission that explains what happened to Praedyth in the VoG (it's in the vault as well) and where he is now! I'm so excited for TTK! If your negative please don't comment thanks.
This was confirmed by Game Informer Magazine
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If you have ever seen The Evil Dead, you will remember the audio tape of Professor Knowby recording his finding on the Necronomicon. This is also used in the end credits of the 2013 remake, Evil Dead. Given how similar the voices are, and how similar the recovered audio's style is, and that the Necronomicon is the book of the dead and deals with demons and the hive are sort of undead......I really suspect it is Bob Dorian from The Evil Dead.