I agree with David, there were several expensive Indonesian kris books published recently and some of them are repeating others and do not bring any new knowledge so anybody recommending a new book should indicate the basis of his recommendation. I saw the presentation of this book but cannot make any opinion about its quality except that it seems nicely presented.
I was told that there is another new kris book related to antique krisses called "Keris Kuno" being published as well and based on the collection of a well-known kris collector & trader from Jakarta, any information about this book will be welcome also.
Best regards