At the end of the Lair of the Shadow Broker DLC (which was awesome!), you are shown various security camera recordings. The narration indicates that more recordings will be available later.
When is later? Is it based on your progress in the rest of the Mass Effect 2 story? Or a real-world timer, maybe based on how close we are to the release of Mass Effect 3? Or does it depend on Bioware releasing new content for it arbitrarily?