From the horses mouth itself:
A substantial proportion of the September CLIMAT monthly land station summary report data that was sent over the GTS (Global Telecommunication System) was obviously incorrect. For the past few weeks we have been liaising with the sources to gain a version that was correct. As this issue affects a substantial portion of the globe we are not in a position to release a 'global' estimate. Nor will we do so until we are satisfied that an adequate amount of verified data is present.
Just as I expected they are too busy "validating" the data to bother releasing it. Why not release it and let Blog Scientists search for errors? We can publish our results in the Telegraph and in an article on the Register, both Journals with a history of fair-handed reporting on the subject.
I can only guess what "liaising with the sources" means. Sounds a lot like a metaphor for "team science"
Can the IPCC finally be disbanded now?