Apparently, the e-book version of Performative Experience Design is available for purchase! I haven't seen the completed text myself, so fingers crossed that nothing went horribly wrong at the last minute.
Of course, these texts are meant for libraries and suchlike to purchase, so if you're not A) a librarian or B) a passionate devotee of performance in an HCI context with C) money to burn, please do not interpret this post as a request to boost my Amazon rankings!
More to the point, if this topic/blog/book is of interest, please get in touch! The more momentum we can get behind the intersection of HCI and performance - no matter what the terminology - the better off we all are.