I can't do his ideas justice, but the path of postmodernism is essentially a form of nihilism that must be broken through to a new level of meaning-making. That is to say, a modern level of development believes there are self-evident truths. postmodern would say that all truths are relative, without basis. An integral or construct-aware level would have insight into meaning-making itself and be able to create "solid" values out of nothing - essentially a post-nihilism.
I don't think theres good language for these stages, so I'm just using "construct aware" from Susan Cooke-Greuter:
http://newpossibilitiesassociates.com/uploads/9_levels_of_in...