One celebrity, it is the format of a usual competition show where there is a group of contestants on and one (or two) is eliminated every episode. I think it's closing in on the finale so yeah we should know soon
The celebs need to be super secretive about their involvement and the bare minimum of people know who's who and who's on the show (most of them only tell their significant other or ... until they're unmasked). Anyway Chris seems to have been getting a lot of tweets about this and he actually tweeted back
You should definitely be flattered Chris xD