Thanks to the heads up from vault2049 on GameFAQs for this information. It looks as though the extra DLCs are now available from the PSN store.

• Sister Prologues: Additional prequel chapters featuring Two, Three, Four, Five and Zero in a playable level with their own unique weapons; each chapter, minus Two, contains its own unique trophy set as well ($5.99 each)

• Sister Prologue Bundle: Contains all of the above prologue chapters, including One ($29.99)

• Furiae’s Garb: The costume of the princess turned goddess, Furiae, from the original Drakengard, please reduce damage taken by 5% when equipped ($2.99)

• Eris’s Garb: The garment of the youngest military commander in Drakengard® 2 prevents stamina loss when guarding ($2.99)

• Intoner Arrange Tracks: A new music pack that replaces the tracks used when Zero enters Intoner Mode ($1.99)

Source:  Square Enix NA