Some gamers have reported seeing an 'incorporeal blob' moving around the Call of Duty: Ghosts trailer, which to my eyes looks like a video artifact. These gamaers have alleged that the blob is none other than a futuristic camo that's perhaps a part of the game's Strike Packages or a perk.
Responding to these allegations (haha, allegations perhaps isn't the right word for it—but claims), Infinity Ward's Tina Pacalos said that she doesn't know what blob they're talking about and that there's no such "ghost armor" present in the game at all.
She wrote on Twitter: "I don't know what YouTube videos you've seen, but there's no such thing as an invisibility cloak, or even an invincibility cloak. Weird…"
So there you go. There's no such thing as invisibility cloaks or ghost armor in Call of Duty: Ghosts.