At the DC Nation panel this morning DC released cover art from various projects, including "Dark Supergirl" returning in James Robinson's Justice League. The most intriguing to me though was of Batman standing over what appears to be the grave of Oracle. Described as a "game changer" by one of the panelists. There is also a Jim Lee piece of Batman strangling the Joker in mid air...I assume this is from the upcoming continuation of "Dark Knight: Boy Wonder" or whatever it has been retitled.
http://www.comicbookresources.com/?page=article&id=28785
http://www.comicbookresources.com/?page=article&id=28785