I finally got around to updating the fidelity and chastity vote in the PC(USA) when ... what should happen but more information comes in within hours of my post. The current vote tally is 74 presbyteries in favor of keeping fidelity/chastity and 46 voting to do away with it. Whichever side is going to prevail needs 87 presbyteries voting their way. That means the "magic number" for fidelity/chastity is 13. Those who want to amend the Constitution have a magic number of 41. It is looking increasingly likely that the PC(USA) Constitution will emerge unfazed, but it isn't over yet.
Of the 53 Presbyteries that still have to vote, 12 voted for a similar measure to do away with fidelity and chastity in 2001 (and all are expected to vote the same way this time around). The other 41 presbyteries all voted to keep fidelity/chastity in 2001. 22 of these were close enough that they realistically could go the other way this year. Even if all 22 switch, though, that would still leave the amendment 7 presbyteries short. All in all, it will be a closer vote than it was in 2001 (which means that this issue is likely to rear its head again in the very near future), but the outcome should still be the same.