This probably falls into the category of "I have no idea", but... will the publisher be issuing new editions with new ISBNs? Or will they swap them in under the guise of a new printing?

(If it's the former, like it should be, then they'll probably reissue new ebooks and all will be well. If they're naughty and just update the text under the same ISBN, I doubt that they'll ever actually update the ebooks with the new text...)