Jacob Sullum went through the transcript of District of Columbia v. Heller and pulled comments from four members of the court that laid out their support of the individual rights view of the Second Amendment.

I suppose a majority of members could vote to support the individual rights view but uphold the DC gun ban as constitutional. I believe that it is unlikely given some of the exchanges between members of the court and Walter Dellinger, who argued for the District.

David Hardy writes that he is expecting a 5-4 decision in favor of overturning the ban and the individual rights view:

My guess is a 5-4 for us, possible a bit better but I wouldn't bet on it, and a narrow opinion by Roberts: a total ban on a class of arms violates the 2nd Amendment. The lower courts can figure out any additional implications, and after a few years we may take another case to flesh it out some more. As Roberts pointed out, first amendment standard of review is a creation of the courts, and they took years on it.