At the moment, the PCA ruling is still accepted by both parties. There hasn't been any official diversion from that. However, in the first negotiations and now in the pre-negotiations for the second item there have been several other proposals floated. None of them have been accepted or outright rejected by either side.
Some of them do not coincide directly with the PCA ruling, and some of them have different directions. At the moment, the PCA ruling still stands and the Abyei Referendum Act still calls for a commission to be set up and the referendum to be carried out simultaneously with the southern Sudan referendum.