Now that preorders are going live I am allowed to write this.

I hate to admit this, but I've had the Codex for a week now. Sadly only had time to play 1 game so far with it.

I'll start with a few favorites new things

Astorath - his axe is back to being +2 strength!

With the bonus to wound making me want to maximize attacks, I think Sanguinor will be a really good choice this codex. Also the ability to leave combat and recharge getting the +1 to wound off again

Librarian Dreads flying are a thing again!

The reroll to wound provide by Lieutenants is great, though I think I am more interested in rerolls to hit.

Sanguinary Guard got cheaper. base cost is now 20. And with Angelus bolters cheaper, that makes the minimum cost per model 35 points.

Stratagems-

my favorite I have not seen revealed by GW is Descent of Angels. 2Cp. A unit with jump packs that deep struck that turn charges with 3d6. Not 3d6 drop the lowest. 3d6.

Artifacts:

My favorite is the banner for the 5+ FNP .

2 others I like,

Angels Wing, jump pack can reroll charge distance and no overwatch by target.

Hammer of Baal. Thunder hammer but without the -1 to hit penalty.

Warlord trait:

Heroic bearing. Units within 6 inches automatically pass morale.

Psychic power:

Quickening

+d3 attacks for the psyker and +3 inches charge and advance.

Some things I found disappointing:

Dante is too expensive for what he does I think. I would rather take Astorath or sanguinor and save points.

DC should be better, the +1 to wound on the charge does not make up for not being able to use the 5++ for the banner and that Vanguard are cheaper and can get more attacks with 2 chainswords per model.

Baal predators are actually slightly more expensive (the base cost got cheaper but the Twin linked assault cannon got more expensive)

Don't bother playing a Successor chapter. the only reason to is if you want to use Seth.

I will try to answer questions when I can. And will probably add more information as I think of it.