The Los Angeles Times reports:
Pellegrini said he was not weighing the constitutionality of the same-sex marriage ban. But questions about its constitutionality arose repeatedly, and Pellegrini said he was concerned about the potential effect of his ruling on various levels of government… The judge has to determine whether the Health Department has legal standing to pursue what’s known as a mandamus action to force a government official to follow the law. He also has to decide whether Hanes qualifies as a judicial officer; if he does, the state Supreme Court may have exclusive jurisdiction.
So it sounds to me like we shouldn’t expect a slam dunk here, but that it could be bounced up to the Pennsylvania Supreme Court.