Includes a digital copy of Batman Year One from XBL or PSN.
From what I've read, saves are incompatible between the vanilla and GotY edition. If you have a vanilla copy, all the DLC except for Harley Quinn's Revenge are on sale for XBL Gold member, details are in the XBL DotW thread.
Repurposing the thread when it was previously a Lightning Deal:
Edited by Sway, 21 October 2012 - 07:10 AM.