"Tortured Soul" is in the works by the same production staff
Now that Corpse Party the Anthology: Sachiko's Game of Love - Hysteric Birthday 2U is out in Japan, fans can enjoy the accompanying OVA, Corpse Party: Missing Footage. It looks like that won't be the last bonus anime for the horror series, either, as 5pb. and MAGES announced an upcoming sequel in the form of Corpse Party: Tortured Soul.
Tortured Soul is being produced by the same production staff that was behind Missing Footage. No more details on the OVA are known at the moment, but hopefully we'll have more information soon. XSEED Games released the original Corpse Party on PSP in North America last November.