The Preorder Is Go!
You can learn more about the particulars of the preorder — and place your early order for both books in the set, including getting access to the almost-complete PDFs right away — at the Evil Hat Productions web store:
Free shipping is available in the USA to people who place a preorder for both books, and the final PDFs will be made available to preordering customers once they are available (which should include the addition of a short story by Jim, still getting written as we speak)! The books will ship out in late June/early July.
Fans of the series may be particularly interested in the second book, which among other things provides a comprehensive character guide up through Small Favor. A handy reference to have on hand as you read through Changes next week.