Unfortunately for some folks who may have spent some really good money on eBay to get the codes for downloading specific character skins that were made available when pre-ordering the game from certain retailers, a lot of the new DLC is those characters, as well as new maps!
"As detailed in the original leak (by the Xbox Live Marketplace) of the DLC release here, the New Map and Character Pack DLC includes new characters Scattershot and Onslaught, as well as Shockwave, Jazz, and Demolishor, who were originally exclusive to pre-order customers at particular retail locations. The DLC also contains two new multiplayer maps, and also doubles the number of maps for the Horde-like Escalation mode to four."
The DLC is to be made available on July 27th for PSN and XBox Live and will cost $10.00 or 800 MS points.
You can check out the official release statement on IGN here, as well as the IG report about the leak, here.
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It will be nice to finally be able play more Esc maps. Hopefully they will be more balanced than the current ones. 
