What you say when hearing old news, when somethingbad but predictable happens to you or when someone brings up something that's long lost its novelty.
Guy 1: "They're out of your favourite coffee."
You: "What else is new?"
Guy 2: "Life sucks."
You: "Yeah, what else is new."
Guy 3: "Pain really hurts."
You: (Just gives him a glance that says "what else is new".) But if he really is stupid enough to make a statement like that, maybe you should have said it in words.