Media Molecule has announced, via their official website that new DLC will be available based on Watchmen. The pack will include costumes and stickers. Your Sackboy can now dress up as Rorschach, Ozymandias, the second Silk Spectre and the second Nite Owl. The costumes are keeping in tie will the recent film adaption instead of the original graphic novel. No price was outlined by Media Molecule but they did state the DLC will be available this Thursday, with the added flexibility of buying individual costumes if you wish.
Source: http://au.ps3.ign.com/articles/102/1028794p1.html