In a filing with the Tokyo Stock Exchange this morning, Sony has revealed a request for information from the US Department of Justice regarding its optical drive production arm, Sony Optiarc. While the same filing indicates the Japanese giant's belief that this information gathering is part of a wider investigation into competition in the optical drive market, we've yet to hear of any other companies facing the same request. If you were feeling disgruntled with the pace of Blu-ray price drops, this might just be your moment of vindication... or it could be a storm in a teacup. There's really not enough information to tell either way right now, but if we know anything about the DOJ, it's that it loves shaking down naughty corporations. We'll keep a careful eye on this as it develops.