In an update today, the company detailed bug fixes and improvements including, one in which "Crota will now recover from his kneeling state after a player quits". It is also fixing the situation that allows two separate swords to spawn at the same time.
Bungie has also changed some of the reward structure. "The existing Pit treasure chest reward moved to killing Ir Yut, the Deathsinger," states the update. "She has a chance to drop Exotic weapons and armor, class pieces, and Radiant materials." Also, "the Pit treasure chest will now contain Radiant Materials." The patches will be deployed early next week.
The update also announced that the Iron Banner event will return, with updated rewards, running from Jan. 13 through Jan 19. Additionally, "Asylum, The Anomaly, and The Burning Shrine maps will be added to existing Clash and Control playlist rotation."
As far as Hard Mode for Crota's End is concerned, Bungie has still not announced a firm date, though it's expected this month. "We're going through the final few stages of deployment. It's almost ready. As soon as we have a concrete date to share, we'll set it in stone," stated the blog post.