Spotify in the United States? You're not the only one, and Spotify CEO and co-found Daniel Ek was once again asked that key question at the D: Dive Into Mobile conference today. His response? The company does indeed still plan to launch the music streaming service in the US, but it can't say when it will happen -- he did confirm, however, that it will cost $10 a month. Ek further explained that the reason for the delay is due to the nature of the service, which requires "complex deals" with recording companies -- there apparently wasn't any mention of any other potential complicating factors.