The next Destiny expansion is called The Taken King, adds a new raid and new sub-classes, and will be available on September 15, according to a report from Kotaku.
A marketing sheet leaked to Kotaku (with sources corroborated) states that The Taken King will cost $40 USD, and adds the usual array of new Strikes and PVP maps, as well as a new raid pitting players against "Oryx, father of Crota." Each of the game's three classes will get a new sub-class, as well as a new super ability: an electrical storm for Warlocks, a gravity bow for Hunters, and a flaming hammer for Titans.
The previous expansion, House of Wolves, didn't add a new raid, but Bungie said that ahead of that add-on's launch that there would be new raid content this year. Last month, Activision revealed that there would be another major release for Destiny this spring, which would be "the biggest addition to the Destiny universe yet, across all modes of play." Around the same time, Bungie trademarked the name The Taken King, along with a logo.
Bungie has declined to comment on the report. If true, The Taken King is likely to be revealed at E3 next week.