
According to those who have deciphered the image, not only will we have House of Wolves to look forward to in March, but 3 more additions to the game. Comet: Plague of Darknes, Vex [unreadable] and Forge of Gods are the names barely readable from the image. Only Comet comes with a planned release date, and it is currently set to September. It is also worth to note that Comet seems to be a disk release, which implies more content than the other DLC's, or that it will be released with the game itself and previous DLC included. The release dates shown seems reasonable enough, and with the details on provided by Reddit we get some extra information of what we can expect content wise.

The Vex and Forge of Gods have no scheduled release yet and there is a little less information provided for these. It looks like The Vex DLC will be located on Mars and Venus and have 3 story missions, 2 strikes, a raid and an unknown amount of PvP maps. Forge of Gods have no information but the name yet.
This information sounds feasible considering the contract between Bungie and Activision that was exposed a while back as part of a lawsuit. The original contract describes four Destiny titles to be released with each receiving a "Comet" release with DLC to follow:

This information seems to originate from the Bungie forums in Italy, and the image is supposed to be taken in an internal Bungie meeting held in October. As with all rumors, we will have to take the information presented to us with a grain of salt until Bungie eventually comes out to confirm or disprove.
If this holds up, what do you think about the content to come? Is this what you expected from Bungie and Destiny?