It’s been a long time coming, but an updated version of the LibreOffice Calc Guide has finally been completed by the Documentation Team.
Free PDFs are here: https://wiki.documentfoundation.org/Documentation/Publications#LibreOffice_Calc_Guide and will be linked from the main LibreOffice website in the new year.
A printed copy can be purchased here: http://www.lulu.com/content/paperback-book/libreoffice-62-calc-guide/26019667