Brent,
Making It All Work is about the two aspects of control and perspective, how GTD really works with both, and how they are tied together. Essentially the roadmap to use when things grab your attention, how to most effectively then put the right kind of attention on them. That includes paying heed to the more subtle "incompletions" at the higher altitudes. Because you need control first, those aspects were the first that GTDers really took to. But the perspective piece (the essence of prioritizing) is still critical for "mind like water." It's actually all in Chapter 3 of the first book, but the new one will flesh all that out quite a bit more...
David