I spoke to RJ tonight. He seems to be well, although he tells me that he has basically stopped outdoor activities for the time being.
He told me regarding the new edition, that everything is finally finished, except the index, which is being finished by the editors. He expects it to be out in the next couple of months, at the latest.
I'm not sure the precise effect that it has had on the project, but RJ mentioned that his father died a few months back, and he has been consumed with the issues involved with that.