Somehow, Reuters has already gotten hold of a draft of the report and, judging from the conclusions that have now been made public, it's anything but diplomatic.
Ministers are anticipating this with a policy of blame dilution: Harriet Harman, the social security minister, was at pains to adopt a bi-partisan tone in her announcement, and the all-party select committee on social security will be given the chance to hold hearings on the draft legislation.