Item prototypes are among the types of things you can see on the Public Test Server. Like all things on the PTS, they are subject to change and in some cases to not make it into the game at all. This happens to be one of those cases. I apologize for any confusion this may have caused.
I don't care if it was on the PTS. It's a great item and was half the reason I bought cartel coins for December. I'm supremely disappointed an otherwise awesome item won't have a place in the game.