I have a copy of the 4th edition; the changes between 4 and 6 seemed like standard changes. Now in the 6th edition, they did start to talk about agile delivery. What the 7th edition has done is take a more agile approach to Project Management. Looking at the differences, they moved from a relatively structured flow to modular. They are allowing for adaption to changes and the project itself.
So to the question at hand: Is it revolutionary? for PMI, I would say no; it is an evolution of a framework that is starting to catch up to the other agile frameworks that are out there.
So it is evolutionary. Adapting to the environment.
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