Well, JW, you started an interesting discussion between me and my friend Jon. He said no they do not technically let the wine ferment, that it is made shortly before Seder, sorry about my previous spelling, and consumed as you said. I then asked why it was called wine and not juice? he said, as it happened to his family years ago, that if you made a big batch expecting alot of company and had much leftover, that wild yeast will do its thing and that maybe that is why it is called wine. If you know more about that I would be very interested in finding out more about it.