Now You See It, Now You Don't

So scientists have created a cloak of invisibility. Even though it only works with microwaves right now, they say "the chance of adapting the concept to visible light is good". Man, how cool is that? I came across this video clip of a Japanese experiment of the same kind of technology but this seems to have successfully applied the concept to visual light. I don't know if this is only a concept video of how such a cloak would work or if it is just a hoax. I have my doubts but I've said this before and I'll say it again...Those Japanese are clever people. Anyway, DM, Wendel the Dwarf is putting on his cloak of invisibility and entering the cavern with sword drawn while Clydophalese the thief keeps his eyes on the slumbering Orcs.