There are nine events in Act II: Restless Sands, Crumbling Vault, Prisoners of Kamyr, Shrine of Rakanishu, Lost Treasure of Khan Dakab, A Miner's Gold, Lair of the Lacuni, Rygnar Idol, and Guardian Spirits. I'm still missing the last few. Where are these events, and what are their spawn conditions? (If in a specific zone, what are their common spawn regions within that zone?)
Diablo – the Act 2 events
diablo-3
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There are various pieces of media outside the game that foreshadow the events that come to pass.
The Book of Cain foreshadows some of the events that come to pass in the game,
For one:
And in the end of days, wisdom shall be lost
As justice falls upon the world of men.
Valor shall turn to wrath
And hope will be swallowed by despair.
Death at last shall spread its wings over all
As fate lies shattered forever.
Take note of Fate.
The Diablo novel The Order, hints at certain person and a diabolical curse.
In the Black Soulstone cinematic, take note of who Azmodan is speaking to... and what he is taking about...
You thought you were so clever, that you would outwit us all. One by one our brethren fell into your trap but not me. I defy you. I know the black soulstone is the key and it shall be mine. Soon my army shall pour forth from the shattered mountain ravaging this world and all hope of resistance . My minions "will" find the stone... wherever you choose to hide it. Then, at long last, Azmodan will reign as the prime evil.
If you have the Collector's Edition Blu-Ray/DVD there is some commentary about the possible fate of certain characters.
From "Leah's Journey," Chris Metzen: "Her spirit's still out there somewhere. There's a good girl there, that deserves to be saved and brought back from be abyss. So, while we don't have any clues yet what subsequent chapters will be (a couple of clues), I would bet that we would chase that down, because it feels right from the story level and it feels right from the character level."
There's still may question that are left unanswered.
The fate an Adria, the Black Soulstone (now that all seven evils are united...), is Leah's soul gone for good?
This forum post includes details on how to find most but not all of the lore books for "Primary Sources", "History of Arreat" and "Espionage".
Primary Sources
Bloodstained Letter - The Keep (Needs confirmation)
Ghom's Log - The Larder
Journal of Hansan Haile, Captain - Bastion's Keep Stronghold, near Vidar
Leah's Journal (13-16) - The Armory, below Leah
Morgan's Journal (1-3) - Morgan's Satchel, Skycrown Battlements/Stonefort
Espionage
Battlefield Reports - Battlefields (walk backwards from Bridge of Korsikk, fallen soldier has blue exclamation point above head)
Orders from Azmodan (1-6) - Messenger of Azmodan (Skycrown Battlements, Stonefort, The Keep, The Battlefields, Fields of Slaughter, Arreat Crater)
Historian of Arreat
Fall of the Barbarians (1-5) - Misplaced Packs, The Keep
The History of Bastion's Keep - Librarian's Scrolls, The Keep
For the beast lore, I believe it is fairly straightforward to obtain by killing all the new monsters in Act 3, but I will look for a good source. It is difficult to describe their locations since many are randomly generated.
Best Answer
Act II
Howling Plateau:
- A Miner's Gold
- Lair of the Lacuni
Stinging Winds:
- The Crumbling Vault
- The Restless Sands
- Guardian Sands
- The Rygnar Idol
Dahlgur Oasis:
- Prisoners of Kamyr
- Shrine of Rakanishu
- Lost Treasure of Khan Dakab