This is just what my first impression of the idea is: A dating site where you hide the user's pictures sounds like a dating site for ugly people.
I think people care about how someone looks, whether they want to admit it or not. I think you're going to have a tough road to user acquisition if people invest their time trying to get to know someone online and then don't like the other user's appearance for one reason or another.
I think it's got some interesting aspects to it; but it's one of those types of ideas that would have to be executed perfectly and have a really good hook for getting users to join. Unfortunately, the answer to that usually including pictures.
I think people care about how someone looks, whether they want to admit it or not. I think you're going to have a tough road to user acquisition if people invest their time trying to get to know someone online and then don't like the other user's appearance for one reason or another.