Update: And here's a leaked trailer which was grabbed via SnapChat.
Original report: Destiny: The Taken King expansion, Rise of Iron, will launch on September 20, Bungie's own website has leaked.
The date appeared on a Bungie.com home page image, which also appears to confirm no more expansion support for last-gen systems.
Not content with this slip up, the expansion was also listed on Xbox.com with the following info:
"Destiny: Rise of Iron is the next highly anticipated expansion to the Destiny universe. The wall which stood for centuries along the southern border of Old Russia has collapsed. Fallen mutants now scavenge the tombs of the Golden Age, and the plague they have unearthed in the wastes is more dangerous than even they understand. Join Lord Saladin. Journey into the Plaguelands. Learn the fate of the Iron Lords and stop the growing threat before it is too late.
"Includes: • New Story Campaign & Quests • New Armor and Gear • New Weapons • New Raid • Maximum Light Increase • New Strike • New Plaguelands Zone & Social Space • New Crucible Mode & Maps • New Enemy Faction and Bosses."
The Xbox.com listing also confirms the September 20 release date.
Bungie is hosting a live stream this evening, during which it is expected to announce a release date for the new content.