Titled House of Wolves it has a supposed release date of March 10, 2015. The locations featured as Cosmodrome, Moon, Venus and Reef. Content included is 3 Story , 1 Strike , 1 Raid and 4 PvP Maps.
Comet: Plague of Darkness is the biggest of the four and most would consider it an expansion. It's release date is sometime in September 2015. The areas you visit are Moon, Venus, Mars and Hive Ship. Included is 12 Story, 4 Strike , 1 Raid , 1 new location, 6 PvP maps, new subclasses and 2 new weapon types.
While Vex doesn't have a release date , it will take place in Venus and Mars. You will able to participate in 3 Story, 2 Strike, 1 Raid and new PvP maps.
The last pack titled War of Gods is very early in development . No further details were shared.
Source: Bungie Forums
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