Got IAv5 today, and it's quite interesting. I've finished reading the story, spoilers lol
which covers the initial fall of Vraks, the assembly of the Krieg Siege Army, the breakthrough of the first line, the Dark Angels assault and destruction of the Space Port, and the breakthrough of the second line, ending on the note of the Apostate Cardinal and Chaos Lord summoning all sorts of crazy stuff. End spoilers.
The Krieg army is interesting. They use Die-Hards, Iron Discipline, Hardened Fighters, Storm Trooper Squads, Heavy Weapon squads (Which I assume to mean Platoons) and Rough Rider Squads. The points for ID, HF and DHs have already been applied to each unit entry, unfortunately. There's no unique Wargear.
Interestingly enough, you don't
have to take a Command Platoon, But you unfortunately can only take one Special Weapon, and to take a Standard it needs to be a Regimental Standard. Support Squads are as normal, barring doctrine costs and no SWS or Sentinels.
Commissars are available as normal, and you have the option of also taking a Quartermaster (battlefield medic character) or a Rough Rider Command Squad, which is a Rough Rider squad with some Command Squad options. Death Riders get 6++ saves, Re-rolls on terrain tests, and Pistols/CCWs in
addition to Hunting Lances.
Elites are Heavy Mortars, Thudd Guns and Grenadiers (Can only take Centaurs, don't get Infiltrate/Deep Strike), and Grenadiers don't get Plasmaguns. Heavy Stubbers count as Heavy Weapons, along with the Heavy Flamers. However you can take the Heavy Weapon in addition to the two specials. They also end up benfiting from Die-Hards and Hardened Fighters, but only pay an additional point for it.
Infantry Platoons
should look the same as regular ones, bar Doctrines and Heavy Stubber Teams, but FW has the statlines and points for all the different officers in the unit entry, while saying the unit consists of a JO and staff. Likely the addition of the higher ranks is a typo. Infantry Platoons are also all you get, no Armoured Fists.
Fast Attack consists of Death Riders (Changes are the same as the Command Squad, minus the Officers and whatnot), Hellhounds (as Codex) and Cyclopses.
Heavy Support gives you Artillery Pieces (Earthshaker and Medusa - you can't get the gun mounted on a vehicle), IA Leman Russ varients, Bombards, Heavy Weapons Platoons, and the option to purchase a Preliminary Bombardment. Super-Heavy Detachments are available as standard, but there's again typos - mainly just how they state which vehicles you can take. Intent is pretty clear, but it can be very confusing RAW. (You can take 1-3 of the following. Each of the following is a 1-3 choice. So you need 5 different Super-Heavies, but can only take 3. What?).
There isn't a damned thing for Dark Angels rules, and I can't be bothered to run through the CRM llist right now.