Codex Speculation

warhammer-community.com/2017/07/05/your-codex-is-coming-july-5gw-homepage-post-1/
>For you gamers out there, one very exciting addition are new rules representing specific sub-groups in many of the major factions; these range from old classics like the Space Marine Chapters or Chaos Space Marine Legions to returning rules for individual craftworlds, as well as previously unexplored groupings like Necron dynasties and Adeptus Mechanicus forge worlds. These will be included in each codex.
So Eldar Craftworlds, Necron Dynasties, Forgeworlds, and more sub factions will actually get different rules, but how much differences will there be between Ork Klanz for instance? Does this discourage custom Klanz/Dynasties/Chapters Veeky Forums?

Think all orks fall under one of the klans, just the "your doods" will be further down the line if your Bad Moons are green or whatever.

Counts as etc. Custom armies basically just get to pick whatever suits them best, so hardly discouraging.

I imagine we'll see the typical klanz and craftworlds that has their own rules in the past. Done in something like chapter trait style with a set of rules/unit limitations. I hope there's a "none of the above" option where you just use the list given with no rules.

>None of the above option
Probably. I suspect it'll hang off the Keyword you choose to make your army.

So I could pick 'Aeldari' and go with whatever, or I could pick 'Saim-Hann' and have a more restricted list, but get some bonuses, like maybe having Windriders as troops.

I expect it'll work like that, anyway

OP here, I think we could see radically different armies based on Klan/Chapter/Dynasty based on Character rules and obviously the quote I copied. Almost all Characters have keywords like attached to them now, and give bonuses to their sub faction, so GW is pushing at least slightly fluffy armies.

That's been a thing for a while. Ultramarine characters are only available for armies with the Ultramarine chapter tactics, etc.

I have to make decisions, since I have both Catachan and Cadian characters in my guard. Do I keep some of them or go with a whole other regiment and have none...

That's the sort of sub faction rules I'd like to have happen. Fundamentally different tactics based on fluff, like Saim-Hann compared to Biel-Tan would go a long way towards closing the gap between fluff and crunch.

Back to chapter traits!

You can have multiple s in your army, user. The characters just won't benefit units from other s with their buff powers.

Yup! This.
Just be careful with certain factions. Admech have the rule that the entire detachment has to be admech to use canticles, and genecult have the same with cult ambush.