I know this - along with a Puritan's Handbook - was one of the most wanted supplements from Dark Heresy fans. With the advent of the Second Edition (and its switch to the Askellon Sector), I doubt we'll ever see such a tome. It's a shame; I find the Calixis Sector to be the richest of the 40kRPG settings, but info on the planets comes in tiny snatches of information across a dozen books.
Lexicanum has little info, with most relevent pages having a one-sentence description. The old Guide to the Calixis Sector has almost no info. Are there any fan-made compilations of info? I'd love to have it all in one place.