Bungie’s Destiny Patch 2.0 has been rolled out right now; there are a lot of updates that also include the beloved Gjallahorn Rocket Launcher that was nerfed. The patch includes The Taken King Crucible preview event and more in preparation for the upcoming The Taken King DLC.

via bungie.net

Below are some of the Patch Notes on Destiny 2.0:

Player Character
· Character Level Cap raised to 34 for all players
· Your Character Level will be grandfathered into your highest possible Light Level from all gear in your inventory and vault
· Character Level Cap will be increased to 40 on 9/15 (requires The Taken King)
· Character Level and Light are now separate stats
· Light is now calculated by the average of the Attack and Defense scores of all your gear
· Weapons, Ghosts, Class Items, and Artifacts now all contribute to Light
· Grimoire Score has been moved from the Character Nameplate and now displays in the

Character Screen
· Attack Power values on weapons and gear have been renormalized in preparation for the Taken King
· Year 1 Attack and Defense values caps have been renormalized for Year 2 (previously 365 Attack is now 170 Attack)
· All Defense values are now on the same scale as Attack
· Weapon damage numbers and combatants have been scaled against renormalized Attack and

Defense values
· Outgoing and Incoming damage has been changed to reflect new Light system
· Ability Damage is directly computed from your Light Score
· Player Health is directly computed from your Light Score
· Weapon Damage is heavily weighted by both your Light score and the Attack value of the weapon

You can see the full change log here.