The Vulture is going to be shipped at 90$ US apparently (some guy from reddit told me this). It'll be shipped with the Agent Locke minifig: the first time the Vulture, and Locke enter consumer hands.
That mystery ship is called the Phaeton Gunship (halofanforlife.com), and comes with the Orbital Spartan carrying what looks like the Halo 5 Rocket Launcher (or Hydra), and that mysterious Promethean fig carrying the Binary Rifle (it's unknown what exactly it is). IF it was a Knight if would actually be a Knight-sized figure, and not the size of a Spartan (I could be wrong. Maybe it IS a mini-Knight fig). My guess is that it's either a new Promethean Variant, or a different hostile Forerunner (maybe the Ur-Didact's new form)/Forerunner Construct (like a Sentinel).
The Gunship has two cockpits: the huge silver shield is the large one, and the the front hatch with the orange square on top is the smaller second one. One is big enough for 1 figure, and the other can fit 2.