[chronotrig]

Episode 4 will come out sometime during the winter Comiket, which starts December 28, I believe.
That's assuming Ryuukishi finishes it on time...It sounds like he's behind schedule, but he says ep4 will be longer and will take a very different approach from any of the other Umineko games.

Edit:
And, just now, Ryuukishi posted in his journal saying that he's got a bad fever...damn