Let´s incite a rumour, shall we? 
"Blood of Martyrs" rebuild the whole way a "Sister" works. Some Fanbozy would say they were "given back" there Icon tools of the Trade (Servo Armour & Bolter). At start.
On the horizone, there is "Daemon Hunter", "Book of Judgement" and "Only War".
A lot of us were complaining about the low powerlevel of Acolythes at Rank 1. Perhaps, FFG is now completely re-inventing the career classes. Or some of them.
"Book of Judgment" could see the Arbitrator getting the same treatment as the Sisters. At least, in the gear department (Enforcer Carapace and Bolter and/or Combat Shotgun from the start). While the Scum might not see to much in new gear, he might be able to pull of some clever tricks using with "Common Lore (Underworld)". Getting some information, getting some gear, getting something done...
"Daemon Hunter" could feature new nice ideas for pskyer and clerics. After all, they are the prime candidates for doing some banishment, aren´t they?
"Only war" ...well,,,you know it.
Of course, none of the three hints at Tech-Priests, Assasines, Adepts, ...
but hey, perhaps they are just getting started?
Just one for the rumour mill.
Greetings
Gregorius21778

, I'm looking forward to seeing how substantiated it is 