The Eye of Horus is great, albeit crazy. Some favorite episodes of mine: 22, 43, 52-55... so hard to choose.
Age of Darkness if you're really into the fluff - they focus on the novels.>>48264894
I hope we get units that aren't right out of 40k. It'll be hard, especially for loyalist legions whose successors have their own codex and special units in 40k, but we don't need new, resin Sanguinary Guards (for example). The plastic ones are great. But there aren't any plastic Terminators with nipple plate yet! Tartaros please.
If it's true that "there are no wolves on Fenris" (i.e. the wolves on Fenris are actually space marines who've gone beyond wulfen to full wolf), then this soon after the Great Crusade there shouldn't be enough wolves to pull chariots. They'll have to get reindeer to pull them.
I'd like to see something like a hunting falcon for WS, as a familiar. Keshig of course, and the obligatory special bike or speeder type. Land Speeder mini-transport? GET TO THE CHOPPA.
Or maybe DA get the jetbike, styled like the one that 40k special character had, with the BFG-like prow.
TS should get golems of some sort.