Destiny’s future content has been leaked due to a glitch a player encountered and some of that content may already be in the disc. You can even glitch into some of these places and be able to see the new enemies, which means the DLC was simply locked and was already on the disc. Maybe not all.

There will be initially two DLCs released for the game which adds new strikes raids and new crucible maps. The raids are important because we have only one right now called The Vault of Glass and it’s supposed to be the hardest raid created by Bungie. The game is definitely lacking content right now and if Activision forced Bungie to cut some content from the main game for DLC, then that would have been a bad decision.

Details of the new content are as follows (thanks, Reddit)

Earth

Strike [Level 10] – The Jovian Complex: A new Hive brood gathers it’s strength beneath the cosmodrome. Find their master and purge them all.

Story Missions – There seems to be 4 more story missions located in the North East section of the map in the Kings Watch section

Moon

Strike [Level 14] – The House of Wolves: No description

Strike [Level 26] – The Summoning Pits: Xyor, the Unwed awaits your arrival at the bottom of the Hellmouth (part of an exotic bounty not new expansion content. Thanks to /u/The7ruth)

RAID [Level 28] – Crota’s End: He waits in the dark below

Venus

Story Mission – There appears to be a new story mission in “The Terminus”

Mars

Strike [Level 20] – The Hypogeum: The ressurection of the Black Garden has begun. Stop the Vex before the Garden’s heart beats again.

Reef

RAID [Level 28] – Reef Raid: No Description

Crucible

Skirmish [Special Event?] – Only the worthy may face the Trials of Osiris for only the worthy are strong enough to endure what is to come.

A string of victories will earn you great rewards – but lose three times and you’re out.

3v3 Team Deathmatch

Level Advantages Enabled

Weekly Rewards

Trial Set Gear

Ascendant Materials

Crucible Marks

You can check out the new content in the video below.