Maybe there's some confounding factor - like sudden recent interest in Singularity/transhumanist topics forcing the cite count up?
Unlikely, they have been highly ranked for a long time and singularity/transhumanist topics are only a very small part of what JCS covers.
...has finally been published.
Contents:
The issue consists of responses to Chalmers (2010). Future volumes will contain additional articles from Shulman & Bostrom, Igor Aleksander, Richard Brown, Ray Kurzweil, Pamela McCorduck, Chris Nunn, Arkady Plotnitsky, Jesse Prinz, Susan Schneider, Murray Shanahan, Burt Voorhees, and a response from Chalmers.
McDermott's chapter should be supplemented with this, which he says he didn't have space for in his JCS article.