For other friends who are eagerly awaiting Charles Martin's new book, the wait is over. Here's the Johns Hopkins University Press link, with words of welcome from Rachel Hadas, Mark Jarman, David Mason & B.H. Fairchild.
https://jhupbooks.press.jhu.edu/content/future-perfect
And you can find "Octaves of Another Eden" (also from the book) here...
https://www.newcriterion.com/issues/...f-another-eden
My copy arrived last week--and of course it's great.