As of today, Higurashi no Naku Koro ni was confirmed a 3rd season. According to Moetron, content, premier date, and so on have yet to be announced.

Guesses on what will be premiered all PS2 exclusive arcs (re-telling of Onikakushi, Watanagashi, Matsuribayashi) and the epilogue.
Sources: http://www.moetron.com/2007/12/17/higurash.../#comment-82911
http://blog.animate.tv/higurashi/index.php?itemid=4175
http://www.animenewsnetwork.com/news/2007-...eason-announced
Youtube video included. I have yet to watch the raw, but it seems this was displayed during the eyecatch of episode 24. Several other sites and viewers have confirmed the truth of this message.
~au ~au ~au ~au ~au I WANT TO TAKE RIKA AND HANYUU HOME!!!!!!

Guesses on what will be premiered all PS2 exclusive arcs (re-telling of Onikakushi, Watanagashi, Matsuribayashi) and the epilogue.
Sources: http://www.moetron.com/2007/12/17/higurash.../#comment-82911
http://blog.animate.tv/higurashi/index.php?itemid=4175
http://www.animenewsnetwork.com/news/2007-...eason-announced
Youtube video included. I have yet to watch the raw, but it seems this was displayed during the eyecatch of episode 24. Several other sites and viewers have confirmed the truth of this message.
~au ~au ~au ~au ~au I WANT TO TAKE RIKA AND HANYUU HOME!!!!!!