Patch 1.11 is out

I just killed the boss of the den and not a single thing happened.

Players of Hell Difficulty Realm games are hereby warned once again,
that a series of new and challenging tests await you! The answer lies
within Diablo's Bosses, which span across the world from the Den of Evil
to the Throne of Destruction...

wtf? I get blue items. I guess the secret is if you wear all blue items you can go fight lilith.

Well, the forum I read said something about 2 new cube recipees that open gates. The items were like... Diablo's Heart, Diablo's something, etc, etc. I'm guessing (if that's true) that those items are going to be random drops from bosses.

I just killed andariel, nothing happened.

Probably a random drop then. Like that jade figurine in act 3. Except it spans all the acts O_o. I guess.

Ya, i justed killed her and got nothing also.

Jade figurine isn't a random drop, it drops off of the first unique mob you kill.