From BGG:

https://boardgamegeek.com/thread/2579065/next-expansion-information-found-steam-game-files?fbclid=IwAR37H8diBo9NvmruvQLT82xuK8K9lgPSVrm_0yCb_YBKH6cpAFM9RbZhAaw

Quote

CONTENTS

6 heroes
6 enemy types
18 journey map tiles
6 roles
6 terrain types

TITLE & DESCRIPTION

Spreading War
The mighty kingdoms of Rohan and Gondor have long been allies against the forces that stand opposed to the Free Peoples. But mercenary forces are forever testing the borders for weakness. From the coast of Umbar to the mysterious depths of Fangorn Forest, the foe has many ways to strike at the heart of such an alliance. Will you aid these two kingdoms in the approaching battles, or will they fall together at the hands of a hidden enemy?

HEROES & THEIR SKILLS (not complete)

Beorn (new race: Beorning)
The Day Will Come
Beast Tongue
Friend of Bees
The First Beorning

Fréahild
Cavalry Combat
Faithful Companion

Renirien
Grey Haven Craft
Mischief

Boromir
Fierce Resolve
Overpower
Born to Lead

Calaminth Took
Hobbit-Sense
Drinking Ditty

Dwalin
Stirring Performance
Ancestral Grudge

ROLES

Provisioner
Shield Maiden
Soldier
Lorekeeper
Guide
Trickster
* Each of these roles has also listed at least 6 of their skill names available for each role. I can post a complete list if people are interested but it's just the skill names.

ITEMS (ones that seem Level I / basic)

Mace
Short Bow
Spear
Plate Armor
Padded Armor
Provisions
Waterskin
* There's around 60 new items (some that seem to be upgrades of older items, like the shield) listed. I can post a complete list if people are interested but it's just fancy names.

MOUNTS
Pack Mule
Friendly Pony
War Charger
Traveller's Horse
Swift Steed
Grumble Bum
Meadow Heart
Witness of Maranwë
Quickbeam
Snowbright

TITLES

Friend of Rohan
Friend of Gondor
Beast Singer

ENEMIES

Soldiers
War Oliphaunt
Uruk Warriors
Fell Beast
Warg Riders
Siege Engines

TERRAIN

Barricades : Heroes and enemies cannot move into this space (unless they can ignore impassable barriers) .
Chests : Test ; 2. PASS, Finally your dilligence pays off! Lore increases by 4.
Fences : When you would move through a fence, you must first test ; 1. If you fail, forfeit that movement instead. After an enemy moves through a fence, their movement immediately ends (even if this prevents reaching their target) .
Trench : After a hero moves through a trench, they suffer 2 facedown . After an enemy moves through a trench, apply 2 hits to that enemy.
Fountain : If you would suffer  while in a space with a fountain, that  is suffered facedown. If you test to negate  or  while in a space with a fountain, you may reveal 1 additional card.
Ponds : If you start your turn in a space with a pond, gain 1 inspiration. After you move into a space with a pond, test ; 2. If you fail, you cannot move out of that space this turn.

You might want to put a spoiler tag in the title.