Turns out the Intergovernmental Panel on Climate Change review will be jointly requested by the U.N. Environment Programme (UNEP) and IPCC, which will greatly add to the influence of the effort. "The mechanism by which such an independent review will take place is under active consideration," IPCC says in a statement.
Chris Field, who co-chairs the IPCC's Working Group II, hinted at some details in an interview with ScienceInsider yesterday. He envisioned the organization running the review being "a major scientific society or a coalition of National Academies of Science." It wasn't that UNEP was imposing the review on IPCC but that the two groups were requesting it in a "partnership," he said.
The organization doing the review would set the terms of reference, said Field, but he said he "hoped" the review would look into a few questions: "Are the IPCC procedures what they should be? Are the procedures being followed properly? Are the authors trained/being given guidance sufficiently? Are new structures needed for new challenges, like correcting errors?" Also, he said, "I would love to see guidance on conflicts of interest from the review."