the restructuring of the humanities

I just saw a reference to the Environmental Humanities. In recent years, I’ve begun to encounter the Medical Humanities and Digital Humanities with great frequency as part of my normal working life. I assume there are other X Humanities which I haven’t encountered yet. As someone fascinated by the tendency towards X Studies and the proliferation of Turns within the social sciences, I’d like to understand this restructuring of the humanities much more than I do. Anyone know of a good analysis of the trend which I could read?