The American Civil Liberties Union filed the lawsuit on behalf of journalists, scholars and lawyers who say the program has made it difficult for them to do their jobs. They believe many of their overseas contacts are likely targets of the program, which involves secretly taping conversations between people in the U.S. and people in other countries.
We'll see how well that holds up.
UPDATE: Here's the PDF of the opinion. I note that the court dismissed the claim relating to data-mining, based on the state secrets privilege. It is only the warrantless interception of international phone calls and email that the court finds unconstitutional.