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]
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You know what... that looks like a vex ship to me. The blue light is similar to the light you see before they teleport. They have the same dark clouds that are only around when the vex warp in. before people go off and say that the vex can teleport anywhere, I say this to you. The vex is a multitude of minds acting as one, so those minds need to have a vessel, and they need to be directed. So thise ships could be what controls the vex, and allow them to teleport exactly as they want, and not into a rock, of off the planet. In summary, that is too similar to vex tech.