New Dragon Age: Origins DLC Named, Dated, Priced - Darkspawn Chronicles

In Major Nelson's May update for upcoming Xbox 360 content, a curiously unannounced item appears listed for a May 18 release for the Xbox 360. It reads:

nope "May 18: Dragon Age: Origins 'Darkspawn Chronicles', 400 Microsoft Points". The only description available vaguely describes the content:
This Add-on, "Darkspawn Chronicles" extends the life of "Dragon Age: Origins," the dark fantasy epic that has you playing as a Grey Warden, one of the last of a legendary order of guardians. With the return of mankind's ancient foe and the kingdom engulfed in civil war, you have been chosen by fate to unite the shattered lands and slay the archdemon once and for all.

The description suggests that the content will be a new quest that occurs after the conclusion of the original game. It is likely that this content will also be coming to the PC and PS3 versions of the game, whatever it might be.