The Advanced Powers MOD specs and commanders

Ostheer
Heavy Infantry - elites
Panzerkraft - customization of vehicles
Imperial Japanese Army - boring, diverse
Regio Esercito (Italians) - elites, ammo types and vet

Soviet
Revolution of the People - troll spec
Armoured Rush - tanks
Shock Army - infantry

OKW:
Wunder-Luftwaffe - offmaps and elite units
Phoenix Projekt - spam
Chem - elite units, critting and debuffing

USF
Heavy Ordnance - elites
United States Marine Corps - offmaps(more air oriented) and elites
War Bonds - good eco, bad units, for support

UKF
Raid - elites, camo and gliders
Trench - basically inf only
Royal Armour - good armor
Magic - elites, inf ability / offmaps

Commanders:(Not in detail, theres also a lot of minor changes to stats and costs but too much effort)

Ostheer

Stuka Loiter now has incend and instapins
Bombing runs have more dramatic effects.

Pak-43 -> Pak-45
LeFH also unlocks a missile bunker

Elefant has an autoloader, limit of 1 removed
Tiger has a gmg upgrade
Tiger Ace has all kinds of abilities and a flamer
Pz-4J -> IKV VI, more utility basically
Pz-4 Command is call in and has an atgm abiltiy.
Stug 3 fires 3 shells
Puma has an autoloader

G43 rifles is now a passive that replaces all mainline squad rifles w faction g43 equivalent.
Stormtroopers have stat buffs and stgs
Veteran Squad Leaders is applicable to far more units.
Ostruppen have faction-specific weapon upgrades.
Arty Officer replaced with a officer w aura buff and retreat point

Soviet

Basically no change to offmaps

Fortifications lets them build a super-heavy tank blocking tank trap
Soviet Industry buffs caches(muni heals nearby troops, fuel repairs nearby tanks)

ISU-152 -> ISU-203, bigger gun and more armor
IS-2 -> IS-4m Vozhd, bigger and better
KV-2 -> Siege KV-2, KV-2 always on siege mode and mobile
KV-1 -> T-43
KV-8 can now fire both guns at once
T-34-85 -> T-44-100
M4 Sherman -> Killdozer Sherman

PPSH inf upgrade now grants AK-43s
PTRS inf upgrade now grants bazookas
Weapon crate grants inf AKs
Guards -> Red Banner Guards (AoE buff unit)
Shock Troops -> Spetsnaz (elites)
Sov Airborne can be paradropped
Partisan -> Civilian Mob (troll unit)
B-4 -> AGAS Grand Artillery (auto firing arty)
DshK -> 20mm shvak (hmg but bigger)
120mm -> Mountain Gun (zis-3 always firing HE w longer range)
Sov Airborne can be paradropped

OKW

Assault Arty covers entire sector
105mm is slightly stronger than vanilla

Pak43 -> super raketan or whatever its called
LeFH also unlocks missile bunker

Tiger -> Orbital Drop Shock Tiger (you drop it like an offmap, then it spawns a vet5 tiger)
Sturmtiger -> Kriegsender (big explosion)
Ostwind -> Raketenwerfer Ostwind (auto fires rockets)

Feuersturm Assault Package now grants fg42s instead of mp40s.
Falls have full FGs from start
JLI have cool upgrades and g43 from start. They kinda suck though
Pfusi is 6 models and has better upgrades. They apply mp penalty if you use them on Phoenix

USF

Rocket Loiter has 4 planes
P47 Strafe -> AC-130 Loiter

Pershing -> T30 Heavy, heavy tank
M4A3E8 -> Needler Sherman, strong firefly
Calliope -> Whizbang, glass cannon tank
M4 105mm -> Sherman Killdozer, tanky 105mm w incend
M4 76mm -> M9 Tank Destroyer, priest but 76mm gun
M10 -> Hellcat, really fast
Commander M8 Greyhound has a special gun, decent AT

Rangers -> Delta Force Operator, elites
Assault Engineers have 6 models
Cavalry Riflemen have unique guns, mediocre
Pathfinders have 5 weapons and a special upgrade

UKF

Observation Post has more arty options

Crocodile -> Black Prince Crocodile, just better gun
M10 has a better gun

Commando Glider Insertion -> Royal Marine Glider Insertion, marines r assault troops
81mm -> 60mm Triple Mortar, mortar fires 3 light shells at once
Land Maty -> Rat Mattress, mattress got mounted on a car
Assault Section -> thompson upgrade for some inf squads