Eh... Tyrant Star was the sort of "main" mystery of the first edition Dark Heresy, though it never got really fleshed out (people were usually telling me that was on purpose so that people could make it whatever they wanted). I guess we will see some canonical take on it here. Whatever, tbh fam I never liked this whole thing much, the first edition Dark Heresy offered a huge number of very cool conspiracies/antagonists to fight against, I hope we will see some of them at least in some side quests or w/e. Would love to go up against the Amaranthine Syndicate especially... we will see I guess.
The becoming Inquisitor thingy - Dark Heresy is not about being an Inquisitor, but about serving one (after all even in Ascended career paths you couldnt become an Inquisitor at all, Interrogator was the highest you could go). Kinda disapointing to see this, I have to wonder why do you start as an Acolyte and not as an Interrogator (Inquisitor in training), which would make sense if there was to be this final promotion as a part of the story. The thing about Dark Heresy always was that the whole thing is low key, you are supposed to trail cultists through hive city streets and eavesdrop on cold traders in space port taverns, not be a guy who can flash a Rosette and requisition an Imperial Guard regiment when you feel like it.
I am glad to see that you can actually be a puritan in the game, all the xeno companions made me doubt that - though I am glad to see a Kroot in the game, was hoping to have them in Rogue Trader already. I am really curious about the investigation aspect of the game as well, hopefully there will be more to it than the usual RPG fare of "talk to 4 NPCs in sequence and collect an item." The game shouldnt be focussed on combat too much in any case, since indeed Dark Heresy is a game where you investigate shit at least as much as you shoot and slash.
Anyway, that all said the devs proved that they have an ability to do the setting justice in Rogue Trader, so I am cautiously optimistic that they will pull this off as well. Will preorder, once the retarded website actually sends me a confirmation e-mail lol.