There was a small segment at Gamescom yesterday. Polygon has a decent write-up.

Most interesting to me is the Gate Lord's Eye Artifact and it's mods:

• Arc Battery, 5 Energy: Grants Overshield and reduced cooldown during activation for all arc class abilities
  
• Heavy Finisher, 7 Energy: Finishers generate Heavy ammo. Requires one-half of your Super energy
  
• Thunder Coil, 6 Energy: Grants bonus damage for all Arc melee abilities and refund Super energy on Finisher Final
  
• Oppressive Darkness, 6 Energy: Causing damage with a Void grenade adds a weaken effect to enemies
  
• Anti-Barrier Rounds, mod for Auto Rifles and SMGs: Shield-piercing rounds designed to bypass combatant defenses. Strong against Barrier Champions
  
• Anti-Barrier Hand Cannon, mod for Hand Cannons: Shield-piercing rounds designed to bypass combatant defenses. Strong against Barrier Champions
  
• Overload Rounds, mod for SMGs and Auto rifles: Uninterrupted fire grants bullets that cause disruptions, delaying ability energy regeneration and lowering enemy damage output. Strong against Overlord Champions.

They also showed two new exotic armor pieces:

• Assassin’s Cowl Hunter helmet - Vanishing Execution: Defeating a Guardian with a melee attack or a combatant with a Finisher grants invisibility and restores a portion of health and shields
  
• Phoenix Cradle Titan legs - Beacons of Empowerment: Your Sun Warrior benefit lasts twice as long once you create a Sunspot. Allies who pass through your Sunspot also gain the benefit of Sun Warrior

Someone on reddit also stitched together the new map of the moon from the brief shots of it: