Just saw a posting in our forums from Engineers of Tomorrow - apparently the Parts Pack for my Mayan Adventure book has shipped and some are receiving it now. Here's a link to the posting, including an itemized listing (and part count) of all that's included.
For those not familiar with this, it's a package of pieces that LEGO Education has released. The Mayan Adventure book was written using the NXT Retail Kit and certain parts are NOT found in the NXT Education kit - until now. This Parts Pack provides the pieces needed to build the five robots in the book for those who own the Education Kit.