The Forward notes that:
As it stands now, the O.U. position seems to rest on a distinction between what constitutes kosher slaughter and what is humane slaughter. According to the O.U., one can have the former without the latter.
"In terms of kashrus, the plant was very much in order," said Rabbi Menachem Genack, head of the O.U.'s kashrut department and a member of an O.U. delegation that visited the Iowa plant early this week. "I was impressed with the commitment of the personnel to kashrus."
It is in the realm of trying to make slaughter more humane that the O.U. has now recommended refinements to the AgriProcessors model.