A few Destiny screens have leaked out from what appears to be the game's upcoming 2nd expansion pack, House of Wolves. The screenshots appear to depict overviews of the game's missions including "Belly of the Beast" and an improperly named mission named "Quest_Nightcrawler." Inferno Rumble and Inferno Skirmish PVP mode overviews are also depicted.
Most interestingly, a new social area much like the Tower appears to be in one of the screenshots. The leaker, Megamanexe4, did not reveal what these locations actually look like aside from screencapping the quest overviews. The same person was also responsible for the previous leak.
House of Wolves is slated for release later this year. No official date has been given to it yet, but it'll probably be out before June, if not sooner.