Middle-Earth: Shadow of Mordor Message Board  

As for now :

The 3 Trials of War, that's pretty much it.

Lists 13 DLC items (some preorder etc) as live on Steam, so you can install them:

Middle-earth: Shadow of Mordor - Hidden Blade Rune
Middle-earth: Shadow of Mordor - Captain of the Watch Character Skin
Middle-earth: Shadow of Mordor - Bundle G
Middle-earth: Shadow of Mordor - Bundle F
Middle-earth: Shadow of Mordor - Test of Power
Middle-earth: Shadow of Mordor - Orc Slayer Rune
Middle-earth: Shadow of Mordor - The Dark Ranger Character Skin
Middle-earth: Shadow of Mordor - Guardians of the Flaming Eye
Middle-earth: Shadow of Mordor - Endless Challenge
Middle-earth: Shadow of Mordor - Test of Wisdom
Middle-earth: Shadow of Mordor - Test of Speed
Middle-earth: Shadow of Mordor - Season Pass
Middle-earth: Shadow of Mordor - HD Content

And from steamdb :

Added name – Middle-earth: Shadow of Mordor - Flame of Anor Rune (about 11 hours ago )

°Pre orders get bonus are items for buying before release.
°Dlc is content that becomes available to purchase usually on or after release
°Season pass is content that is available over a period of time after the game has released

people seem to be confused about this.

Middle-earth didn't have any pre-order bonus did it? also I'm 99% sure I pre-ordered.

It had :

-Those who preorder via Amazon will be able to access the Deadly Archer rune, which allows Talion to deal extra damage when firing ranged headshots again Sauron's Captains.

-Fans who go with Best Buy will get the Flame of Arnor rune, which grants Talion the ability to ignite his blade by executing a high combo count, which can incinerate enemies.

-GameStop will be offering preorders the Captain of the Watch/Hidden Blade rune, which grants Talion extra damage when performing stealth attacks against Sauron's Captains.

-Finally, fans who preorder on Steam will be granted access to the Orc Slayer rune, which gives Talion extra damage when carrying out special attacks against Sauron's Captains.

Only some runes