The reason it will be such a wait is that he is in the midst of revising On Cooking ! I asked why, after all this time, he is revisiting this monumental work. He said "that there are many more foods to talk about nowadays, and people want to know about them in much greater detail."
He also said that he will be touring in support of the new edition. Very exciting to those of us who are McGee fans.
Just thought I would pass it along.