The patent lawyer community is getting nervous:
They are probably right to be. A delay this long in the decision most likely means that the Court is waiting until the end of the term to release it - which they traditionally do for what the Justices consider to be their most important and/or far reaching decisions of the year.
It may also be the case that there are either important dissents or concurring opinions on the case, thus prompting a delay with back and forth rewrites and revisions to the final decisions. (Though one should recall that at oral arguments, the Justices seemed universally critical to the idea of broad-based business method patents.)
The decision has to come down by July 28th at the latest, when the court has its final decision release day of the current term.
Three weeks and counting...