The old fluff was.. Let's call it Constellationally challenged.
Pretty much nobody living anywhere in the Calixis sector could give you a straight answer, if you had the audacity to point straight up at noon and ask: "What do you guys call yours?"
Because while there were an abundance of inhabited planets and other objects in need of a stellar body to orbit, there was a dire shortage on stellar bodies. I haven't counted them, but I'd guesstimate there were maybe 10 stars in the the entire Calixis sector.
So please, dear developer guys, let's not have a repeat of this, yeah? When you come up with a place, put it somewhere. And try to make it somewhere sensible, if you can. I don't expect you guys to have degrees in astrophysics, but I promise it won't hurt you to crack open a layperson-oriented book on the subject.
Another problem the Calixis sector had, was that you were extremely unlikely to be in a position to go somewhere to point up at the local star and ask the awkward question above. Because there weren't any Warp Routes, and the Imperium doesn't really do interstellar STL travel. So yeah, if you weren't living on Scintilla or Iocanthos, chances were you weren't going anywhere. Missions for the God-Emperor be damned.
So lets have some Warp Routes between the Star Systems, shall we?
And while you're at it, you should stick the old White Dwarf Warp Travel times in the core book, under the goods & services chapter somewhere.
Oh and! Whatever you do, please leave the otherwise awesome Rogue Trader's Warp Travel nonsense out of it. DH isn't a game of Warp Incursions During Transit, and even if it was, the RT ways of handling this are somewhere between painfully stupid and hopelessly unwieldy (oh Navis Primer, you're like the Smelly Cat of RT. I almost don't regret buying you, or the IQ I forever lost from reading you).