The Justice Department has filed a brief in the Cambridge University Press et al. v. Patton et al. case by for a 21-day extension in which to "to file any amicus brief in support of appellants or in support of neither party."
Here's an excerpt from "Obama Administration Considers Joining Publishers in Fight to Stamp out Fair Use at Universities":
In digging into this, we've heard from a few sources that it's actually the US Copyright Office that has asked the DOJ to weigh in on the side of the publishers and against the interests of public universities and students.