I, myself, don't even know the exact details. I don't read the manga, so this is speculation on my part too. I don't know what it looks like, I don't know how Naruto will use it, and I don't know when he'll use it. All I know is its name (which I got from this forum) and how it works. I'm on this thread to speculate, and I apoligize if anyone feels spoiled because I said it looks like chidori.