So the codex has been released for more than a week now, and I had a few test games with it to see what works and what doesn't. Based on my experiences I came up with this list.
Let me know what you guys think and where it should improve.

List:
HQ
Coteaz (goes with one of the GKSS)
Librarian (goes with one of the GKSS)
3 spells (shrouding, might of titan, sanctuary)

Troops
Henchmen 5 assassins, 5 crusaders, 1 banisher+eviscerator
10 GKSS
- 2 psycannons
- psybolt ammo
10 GKSS
- 2 psycannons
- psybolt ammo
10 GKSS
- 2 psycannons
- psybolt ammo
Heavy support
Dreadknight
- Nemesis Greatsword
- heavy psycannon
Dreadknight
- Nemesis Greatsword
- heavy psycannon
Elites
Vindicare assasin

Reason I took Corteaz is because I hate deepstriking suicide squads (I REALLY hate em) and he gives me a cheap cc squad that can counterassault anything that threatens my gunline.

The idea is to slowly walk to the centre while I keep firing all those psycannons and stormbolters (str 5) at transports and infantry. Keeping all those squads shrouded should be possible.

Dreadknights are there to counterassault as well, and to draw heavy fire to them.

Vindicare assassin to take out those annoying librarians/Hq's/2 wound Nobs, thunderwolves, paladins or av 13/14.

Thats it in a nutshell. Let me know what you guys think!