Eris and the Queen belong to a group called the Hidden. Eris pulled the Queen from her ship by teleporting her like we were teleported from Crota's End. The Queen was the "contact near Saturn that said the weapon only fired once" - Ikora Ray. Eris and the Queen worked together to get Oryx to fire the weapon to kill his men and the Guardian would kill Oryx, therefore eliminating the threat of the Hive from returning. Soon, the Queen will return to fight alongside Petra Venj to kill the Cabal when they come into the system. The Cabal sent a distress signal to the head of the Cabal empire after all. That'll be the 2016 DLC Bungie is talking about. Give me y'alls thoughts!!!