This adventure is a continuation of Scourge of the Sword Coast and is the latest D&D Next based Encounters scenario.
Interesting note in the product info says it's a homage to the mega-dungeon crawls of old, as a delving the insidiously named Doomvault is a feature of this adventure.
Snagged my copy this morning. $18 bucks for 107 pages isn't bad at all. Haven't had time to read through it, so hoping it holds up to what I saw in the Scourge of the Sword Coast. The Doomvault is a pretty big dungeon.
The story behind this adventure seems to deal with Szass Tam's deathgrip on the nation of Thay. Interesting times ahead I do believe. ;)