https://www.bungie.net/en/News/Article/44484/

So is there a glitch with Orxy where he won't attack if you are dancing?

Considering that it's about 20 minutes for a complete Challenge, I say "not a big deal".

I'm happy to see this summary...

Too long, did not watch:

• The April Update arrives on 04/12/2016
  
• New content will be available to players of Destiny: The Taken King
  
• The King is dead, but the Taken War rages on in our Solar System
  
• Variks the Loyal has a renewed call to arms to battle Taken foes
  
• Guardians will face new challenges through new Quests, Bounties, and Strikes
  
• Maximum Light is being raised to 335, with many new ways to level up
  
• Prison of Elders has a new Level 41 mode to empower you reach 320
  
• Challenge of Elders is a new Level 42 scored mode to empower you to reach 335
  
• Players who achieve High and Cumulative scores are guaranteed Weapons and Armor
  
• Challenge of Elders rewards have up to 335 Light, depending on your power

Not mentioned on stream, but also totally true:

• King’s Fall will drop rewards up to 330
  
• Court of Oryx will drop Artifacts up to 335
  
• Sometimes I forget to ask the most important questions

Mentioned on stream, but not actually true:

• Prison of Elders does not have checkpoints (oops, sorry)
  
• This is what happens when we preview work in progress on a live show