Konami has announced via
Facebook
that the Castlevania DLC, Reverie, has been delayed for the second time.
"Unfortunately, the "Reverie" DLC for 360 has been delayed due to a last minute issue which we hope to have fixed shortly. We understand that this news may frustrate you but please know we are working with Microsoft to resolve it as quickly as possible and give you the level of polish you deserve. We will update you as soon as a release date has been finalized and appreciate your continued patience. "
No future release date has been offered.