The Witherspoon Society (an organization of Progressive Presbyterians) has been reporting and analyzing the most recent decision of the PC(USA)'s PJC for the past week.  The most helpful analysis is by Gene TeSelle:

G-6.0106b, adopted in 1996-97, prohibits ordination of any person refusing to repent of a practice that Scripture calls sin. There are many activities that the Bible calls sins, and Presbyterians are clearly divided over whether, or in what sense, some of them are even sins. Despite this, same-sex relations have been singled out, and the people involved in them have been scapegoated as the essence of sin. We must note that the meaning and application of this paragraph, even as it applies to same-sex relationships, are contested and will continue to be the subject of many appeals to the Permanent Judicial Commission.

The PJC decisions upholding the letter of G-6.0106b are authoritative for the time being. They have gone against the letter and the spirit of the most recent Authoritative Interpretation by the General Assembly.

The PJC's interpretation (or misinterpretation, as many of us see it) can be corrected in two ways, both of which should be pursued.

The coming General Assembly can and should issue a new Authoritative Interpretation.

At a minimum this should declare that not every "shall" in the Book of Order is an essential of Reformed polity, leaving many of these details to discernment by governing bodies or to further interpretation in judicial cases or interpretations by the General Assemly.

But the Assembly can do more. It can correct these recent rulings by the PJC to state that ordination requirements are also subject to discernment by governing bodies in accordance with G-6.0108b.

Beyond issuing an AI, the Assembly can and should send to the presbyteries an amendment that alters G-6.0106b in ways that are more in the spirit of the 2006 AI. Several such amendments have already been proposed in overtures adopted by presbyteries.

I would also note that this particular ruling has an effect on GLBT persons seeking ordination.  As anyone who follows the PC(USA) is aware, the church has GLBT clergy -- a few like Janie Spahr and Ray Bagnuolo are out, but most are closeted.  The 1978 Definitive Guidance allowed GLBT persons who were already ordained to continue to serve.  Even the further constraints of "fidelity in marriage, chastity in singleness" later added have not been effective in stripping GLBT clergy of their ordination, but rather have limited the ability of GLBT clergy to accept a call in a new Presbytery (as happened with Janie Spahr when she tried to move from the Bay Area to Rochester, New York).