[friism]

From the "Safe Harbor Compliance is Coming Soon" section:

    Heroku is not yet a registered participant in the Safe
    Harbor program. We’ve laid the groundwork for becoming
    Safe Harbor certified and expect to have it soon. The
    Europe region public beta is designed to let you build
    high-performance apps for European users. It does not
    currently address data residency or jurisdiction concerns. 
    You should assume that some portions of your app and its
    data will be in, or pass through, datacenters located in
    the US.

[hiddenfeatures]

Oh sh*t. I didn't read the website (only the newsletter). Thanks for posting, though. Should be helpful for others as well!