World of Warcraft v4.1.0 Patch and Rise of the Zandalari Trailer

From v4.0.6a to v4.1.0
Blizzard issued a new patch for World of Warcraft, bringing their popular MMORPG to v4.1.0 (thanks: The Patches Scrolls). Check full story for changelog.
Update: a new trailer detailing the changes added by this patch is now locally mirrored (thanks: Blues).