I'm in the middle of reading it, but the viewpoint and arguments being made (not to mention overuse of oscillation/pendulums/art-as-cycle) hit me as being rooted there. There's not much to go on in terms of pure-visual MM artworks, a few performances by Ronkko, Turner, LaBeouf and some academic critiques.
The gist is an oscillation between the PostModern methods of operation (Irony, Pastiche, etc) and more sincere methods of expression. A balancing act that displaces the artist back and forth between objectivity/subjective belief, Abstract and concrete image. But what separates these works from proper Modernist/Postmodernist works is the cognizance of both and utilizing eithers methods in differing degrees.
Take a look at the "New Metamodernists" on FB, Notes on Metamodernism blog and do a search of Google Scholar. Hell, I attempted to make a API-Art service in a metamodern fashion, have an exhibition coming up wwhere I play with these techniques as well.