Deep in the forest of Cormanthor lies the hoard of the dracolich Dretchroyaster, the prize of which is a diamond staff rumored to unlock the secrets of an ancient elven kingdom. The sage Imani is seeking dozens of adventurers to launch an all-out assault on the undead dragon's lair. The dracolich is a powerful foe - too great for even several parties to conquer - so it's going to take all of the heroes' courage, cunning, and speed to survive the dracolich's deadly vault.
"Vault of the Dracolich" is a Dungeons & Dragons Roleplaying Game adventure designed for the June 2013 D&D Game Day. The challenge draws inspiration from the interactive format used at some gaming conventions.
As far as I know this is the first commercially released 5e product (there is a Murder in Bladur's Gate but that is different) and would seem to be aimed at the folks with the Next playtest kits.
I will say the fact that it is now labelled as fifth edition (5e) saddens me a little as I liked the unnumbered "next".
Over a drivethru, pick it up: Vault of the Dracolich.