So I know it's stated that you will possibly work on adding stuff for the other factions so that got me thinking about what could be added to them so some of my ideas are:

Human Factions: y'all probably already have those planned out so I'll skip them.

Dwarfs: I can see the normal dwarfs going full steampunk with massive flying ships and mechs/steam automatons and the chaos dwarfs doing the opposite and going full dieselpunk with giant mechs powered by oil and daemons.

Elves: So for the high/dark elves im struggling with ideas but with the Wood Elves I can see them having maybe organic weapons? Like wooden guns that shoot magical energy, whether thats literal guns or maybe some type of forest spirit artillery. Also I can see their engineers being able to plant vine walls as cover, thorn bushes (barbed wire), and maybe a "mine" that when triggered actives a menace from below spell.

Vampires: so for the VCounts I kinda imagine a mix of the zombies from CoD and Sniper Elite. For VCoast no ideas pop up other than just a naval version of the counts with being able to bring in naval cannons onto the field.

Skaven: probably what already exists but turned up to the max so maybe some scavenged vehicles with a skaven twist and maybe their infantry guns use warp energy. Also looooooots of chemical warfare.

Slaanesh: corrupted versions of fast tanks that are made to be faster and extremely deadly when charging. Also their infantry could have an effect like 'Beautiful Visage' which gives them extra missile resistance cause the enemy just cant bring themselves fire directly at them.

Nurgle: focuses on swarms and death by attrition. Has hoards of poxwalkers and their artillery is all chemical weapons with effects like 'corroding metal' which debuffs the enemy's armor and weapon strength while also causing some DoT and as a nice bonus if an ally is affected by it it does the opposite for them.

Khorne: focuses on transport vehicles since all of his units want to get directly into the fight and maybe his hero/lords have an ability called 'Bloody Charge' that gives either all units or just those around him increased speed, charce bonus, and missile resistance.

Tzeentch: all i can think of is maybe a unit that's sole purpose is to increase the regen of the barrier for units around it.

Tomb Kings: maybe something involving their pyramids, constructs, and soul magic.

Warriors of Chaos: a mix of all the other daemons' stuff and generic chaotic stuff.

Lizardmen: maybe Old Ones tech (idk)

Ogres: ???

Beastmen: ???

Greenskins: hard to think of anying other than just 40k orks which i know isn't allowed so idk.

Norsca: ???