The FAS (reputable german newspaper) on the front page: "Berlin wants to see torturers in court", according to the article politicians from all german parties think a criminal prosecution is necessary. Most likely there won't be any real consequences in the transatlantic relationship, if there isn't, as we are perfectly fine dealing with countries like Russia and China in a semi-friendly manner most of the time. The US has already lost a lost of prestige in the matter over the years, given that the black sites and "enhanced interrogation techniques" were more or less public knowledge. Ideally the whole Bush administration would be put on trial for war crimes and violations of the torture conventions, but that is a pipe dream of course.