Warcraft Adventures: Lord of the Clans is a point 'n' click game that Blizzard cancelled in 1998. It's an adventure charting the origins of Horde hero, Thrall. This weekend, the game was leaked in its entirety, but the file has already been pulled, and the file is no longer available for download.
The leak was posted by Reidor on the Scrolls of Lore forums, and contains a "full pre-released version with in-game cinematics". Blizzard did not comment on the leak, but they might have already taken action to take it down.
The game was a hand-drawn point 'n' click made to add humanity and humor to the series, with the goal to make the Orc faction more relatable and sympathetic.
But after several days, Blizzard cancelled the game days before its E3 1998 presentation, seeing it as inferior to LucasArts' Curse of Monkey Island.