Preparation for Out of the Abyss

The next season of D&D Encounters is based on Rage of Demons Out of the Abyss--basically, Demons in the Underdark, which is just an awesome topic!

Here is the blurb
Rumors of demonic activity in the Underdark have reached the surface through whispers and hushed tales of violence. King Bruenor sends his friend Drizzt Do’Urden to find out what’s happening beneath the surface but it becomes all too clear when the demon lord Demogorgon ravages the drow city of Menzobarranzan. The Horned Lord Baphomet toys with victims in the vast maze of the Underdark and the Demon Queen of Fungi Zuggtmoy plans to join with a massive city-sized fungus in an insane marriage ceremony. Yeenoghu, the Demon Lord of Gnolls, wanders the dark, spawning new gnoll servants from his kills to continue the destruction, while the demon lords of lust and deception prey on the weak-willed peoples of the Underdark.
In the madness of the dark, who will be the light to shine against the demons? The races of the deep vie against the demons but there are few allies in the Underdark among drow, mindflayers, duergar and deep gnomes. Drizzt Do’Urden and the magical panther Guenhwyvar are dedicated to tracking Demogorgon and putting a stop to his reign of madness but it’s even more crucial to find out why the demon lords came out of the Abyss at all. Who is responsible for the chaos that’s been unleashed? Solve the mystery before the demons reach the surface. Dare to descend!

There is already a Players Guide up and the Adventure comes out in a few days, for which there is a Synopsis

Dare to descend into the Underdark in this adventure for the world’s greatest roleplaying game!
The Underdark is a subterranean wonderland, a vast and twisted labyrinth where fear reigns. It is the home of horrific monsters that have never seen the light of day. It is here that the dark elf Gromph Baenre, Archmage of Menzoberranzan, casts a foul spell meant to ignite a magical energy that suffuses the Underdark and tears open portals to the demonic Abyss. What steps through surprises even him, and from that moment on, the insanity that pervades the Underdark escalates and threatens to shake the Forgotten Realms to its foundations. Stop the madness before it consumes you!
A Dungeons & Dragons adventure for characters of levels 1–15