After writing The Anarch has the author said anywhere that this is his final book in the series?
I mean the last 3 books are together called "The Victory"...
From an interview with Abnett on Track of Words:
Track of Words: What’s the elevator pitch summary for Anarch?
Dan Abnett: This is the climax of the fourth arc – The Victory – and the culmination of the battle for Urdesh (and the fight against the archenemy Magister, Sek). It’s not the last book in the series, but it’s a very major piece of punctuation, completing some story strands that have been running for years. A very ‘big’ book (incidentally, the longest novel I’ve written, but that’s not what I mean by big). Essential reading for any Ghosts fan.