Let's talk about the taken. This is the race that Oryx belongs to and probably the masters of the hive. And I'd he willing to be these ships belong to them. Why? Well in early art release there was a banner showing all 4 of the enemy races. Fallen, hive, cabal, vex AND another. And I would he willing to bet these ships belong to them.
[spoiler]Oh BTW watch the planet destiny video on taken king for more info[/spoiler]
-
Sorry to ruin the whole thread, but the Taken aren't a new race, they are a new Hive enemy type.