Donald knows what's up, oh aye.
Just wish the Cynis Ejector counted; Rite of Destruction on that thing, ooh.
Hector Cephas did a quick review,
http://battlebunnies.blogspot.co.uk/2017/12/horus-heresy-age-of-darkness-rulebook.html
Things that stand out: [That weren't already mentioned]
"if there is a AoD datasheet for the [LoW] in question then that will trump all other legacy versions of it (so Imperial Armour, 40k Apocalypse, etc). For example, if you wish to use a Baneblade in a Legiones Astartes army list, you must use either the Solar Auxillia or the Militia Cults datasheet for the Baneblade"
Not sure how that'll effect non-
FW Baneblade variants (looking at the Escalation book), where they have explicitly
40k rules, not 30k rules.
"models must be at least 25% obscured to gain the cover save granted by the Fortification in question - no hiding big tanks behind tiny walls."
Unless you get funny with hill slopes, as it were.
"just the older pre-Wall of Martyrs fortifications exist in AoD however it appears that on top of that, the Fortress of Redemption and the Skyshield Landing Pad are also conspicuous in their absence."
So no pipes (and thus no boosting flamers) or Void Shield Generators, etc.
That grenade thing is nice; as I believe, they've removed the restriction of only being able to use one per turn, even if the whole unit has them.
If that is the case, Ferroxian Thallax might actually be able to murder Landraiders now.