According to this report from Animate, a 30-minute special for the upcoming Higurashi live-action movie will air Monday, December 24th on Sun TV. The movie itself will be directed by Ataru Oikawa and will star Gouki Maeda (Keiichi) and Rin Asuka (Mion). A Spring 2008 release date for theaters has been set.

Source(s): [1], [2]