We print the guides in very large print runs. When it's time for a new print run of a guide, we do make any minor corrections we may have noted and any updates that are needed based on what is on the website's updates section. For example, with the latest print run of Beyond and Bigger, Beyond was changed to include the updated page numbers for Stories of the Pilgrims, along with a few minor corrections. Bigger had only minor corrections and no updates needed. So, unless a book goes out print, there are no major updates.
The next print run of Little Hearts is likely to be in the summer and will include the updated changes for History Stories for Children, Jerry Muskrat, and the Family-Time Bible right within the daily plans themselves. It will continue to schedule the same version of Singapore Earlybird Math 2A/2B that the guide contained previously, as we will stock that product mid-way through 2012 for sure. I hope that helps some.
Blessings,
Carrie