The official site got updated with specs for the 4th volume of 「Higurashi no Naku Koro ni」 and it’s supposed to come with a second mini-Soundtrack disc. The first mini-OST came with DVD Volume 1 and has two tracks which do not appear on either of the full OST releases. More Kenji Kawai = hurrahz.

「 ひぐらしのなく頃に 」 四 【初回限定版】 + ミニサントラＣＤ２「雛見沢探訪」 Higurashi no Naku Koro ni Vol.04 Limited Edition + mini-SoundtrackCD2   Kenji Kawai 2006.11.10 : FCBP-40