Here are the Release Notes for Update 23: Where Dragons Dwell.
Of Special Note:
Where Dragons Dwell
Update 23 features a journey into the homelands and histories of the dwarves, including the Longbeard descendants of Durin the Deathless. Beginning with an expanded Erebor, you will adventure into the fabled Iron Hills, and finally arrive in the lost dwarf kingdoms of the Grey Mountains. The Where Dragons Dwell Quest Pack is free to VIPs and Lifetime Account members, and includes more than 120 quests and deeds, along with three resource instances, a new Instance cluster, and releasing soon - a new raid! These new Instances are currently available to play up to Tier 2 difficulty, and a new Tier 3 difficulty will be released soon! Tier 3 is a new challenge level that replaces the former T2C difficulty, and offers a new challenge in addition to new rewards.
Black Book of Mordor: Chapters 7 and 8
Update-23-Release-Notes