Lawyers who dictate using Siri: where do your words go?

I was forwarded this news story from Wired, which suggests that everything that is dictated on Siri gets sent to a computer in North Carolina. Assuming that's true, does that fact by itself raise a confidentiaility issue? Or do we need to know what happens to the data and how it's used before we conclude that there's a problem? I believe that similar issues were raised regarding Google Docs and my sense was that one needed to understand the details before drawing conclusions.