Lifted from warseer c/o Reinholt
I have highlighted some interesting bits:
Battlehosts are self-contained formations that work as follows:
1 - The cost of the formation is xx points + the cost of the units within the battlehost.
2 - The contents of any battlehost are as follows: one or more epic heroes / legendary formations, one or more standard formations, and one or more optional formations. Each formation is listed with the number of companies that may be taken, so for example, the Swan Knights battlehost might include Imrahil between 2-4 formations of Knights of Dol Amroth (with 3+ companies per formation) and 0-2 formations of Men at Arms of Dol Amroth (with 2+ companies per formation). Note: These are not the actual numbers, just examples.
3 - Each battlehost has special rules that apply to the units within the battlehost, and sometimes pertain to being within a certain range of the leader of the battlehost (or with that character in the unit).
4 - There are a set of fortunes and fates specific to each army that may only be taken if a battlehost for that army is taken. As an example, the Gondor & Arnor fates may only be taken if a Gondor & Arnor battlehost is included in the army.
5 - Battlehosts do not count towards the decree of rarity, and stand outside the usual organization, similar to a Legendary formation. However, taking a battlehost from another army list means that the entire cost of the battlehost counts against the allies allowance.
6 - There are way more than 10 battlehosts. I clearly don't recall them all (so this list is not exhaustive), but here are some that I recall:
Gondor & Arnor:
- Knights of Minas Tirith with Faramir as the leader
- A Swan Knights formation with Imrahil as the leader
- The defenders of Minas Tirith with Gandalf and Peregrine Took
- Denethor's personal guard, with both Faramir and Boromir, as well as several of the elite Gondor units (like the guardians of the fountain court)
- A ranger-heavy formation with the Ithilien rangers led by Faramir
- The united fiefdoms force led by Forlong the Fat including axemen, clansmen, and the blackroot vale archers
- Theoden and his personal bodyguard
- Erkenbrand along with either Erkenbrand's riders or riders of rohan (who have the spectacular special rule that the units in the battlehost fight at the same time as monsters)
- Eomer's riders, with gandalf and riders of rohan allowed in the formation
- A wood elf heavy battlehost with wood elves, sentinels, the option to take legolas, and thranduil as the leader
- A rivendell based list with Gildor, Elrond, Elladan, Elrohir, and multiple high elf units
- A lothlorien list led by Galadriel and Celeborn with multiple galadhrim formations allowed
- Haldir's elves at helm's deep, with Haldir leading and Galadhrim infantry as the bulk of the formation
- An Erebor list led by Dain, with a large smattering of dwarves as the choices
- Drar's hunters, with more dwarf rangers (I recall them having a few very interesting special rules, such as 6" move for the units in the formation and master pathfinders, as well as the ability to move 6" and still shoot bows)
- The last march of the ents (treebeard plus many ents)
- The shire's defense forces (with multiple hobbit formations, gandalf, and some of the other hobbits)
- The gorgoroth horde (a 12-18 company formation of orcs, with potentially multiple captains and all weapon options considered to be had by the formation - sword/shield, bow, two-handed weapons)
- A winged nazgul formation
- The fortress of barad-dur (led by the mouth, with orcs and black guard, as well as some black numenoreans)
- Morgul rats (stalkers, Gorbag's guys, and more orcs)
- Shagrat's guard at cirith ungol
- Gothmog's boys (multiple units of morannon orcs and gothmog)
- A siege formation of orcs (gothmog, grishnak, flaming catapults that ignore cover, orcs, and trolls)
- A formation of multiple units of Morgul Knights led by either the dark marshal or the Mouth.
- The fighting uruk-hai led by saruman
- A scouting formation led by lurtz, with multiple uruk-hai scout units, possibly including ugluk and mauhir
- A scouting formation led by Ugluk, with the capture hobbits from Amon Hen, including some orc units, Mauhir, and scouts (with multiple special rules, including D10 vs. shooting at the units with hobbits in them to represent heroes not wanting to shoot the hobbits, the ability to eat orcs to feed the uruk-hai, and Mauhir's boys ambushing)
- A siege formation led by Vrashku
- A misty mountains formation of massed goblins led by Durburz or a Balrog
- A misty mountains formation of beasts led by Druzhag
- Khamul leading Kataphrakts, Archers, and Warriors for the Easterlings
- Suladan leading serpent guard
- Dalamyr leading a corsair army (with the corsairs gaining berserk, making them actually worth fielding, though needing to be within 12" of Dalamyr or having an increased chance of hurting themselves when berserk) of normal corsairs and arbalesters
- The Betrayer and/or the Knight of Umbar leading a combined force of Harad
- The Gold King of Abrakhan (with special rules similar to his LotR Skirmish rules) leading Haradrim, with Khandish allies and half-trolls possible
- A Mahud Warband (with a mumak)
- A tide of mumaks (3-6, if I recall)
- A watchers of karna themed battlehost (where the units gain enchanted cloaks)
- A formation of carn-dum barbarians and angmar orcs led by the Witch King
- A spirit heavy formation led by the Tainted and/or the Dwimmerlaik with multiple special rules for the spirits to increase their effectiveness (more strength near the Tainted, more defense near the Dwimmerlaik, with shades that do not impact the ability of the spirits, only non-battlehost units)
- Burhdur's warband (with everything ambushing, and units from the misty mountains rolled in and not counting against the allies allowance)
Overall, the book seemed pretty well balanced. I didn't see too many things that were pointed poorly, and some of the weaker choices in War of the Ring (corsairs, spirits, some of the gondor formations) got major boosts by being part of the battlehost that they are included in, giving a much stronger reason to field these units.