Reddit is great. But where are the private sub-reddits?

I always liked it in theory but never used it much. Perhaps because the designs and fonts are so unappealing (though I don’t like to think of myself as so easily swayed by such things). Now I’m looking at it every day. It’s superior to Newsvine, Newsnow, and in some ways better than delicious. But when are they going to release these fabled new features?