Hi David,
so I’m not entirely sure about how and if the essential excerpts will be updated, but if you send them to me (in PM or at tv@lernapparat.de), I’ll check that we’re fixing them for the “proper” book, it might be just in time to sneak in typo corrections before going to print, and also forward it to the people who extracted the essential excerpts.
@elistevens and @lantiga are on the forums, too, they’ll be delighted to hear that the book is useful, too.
Best regards
Thomas