Check this out ...
Jessamyn already has the links and has already started parsing out the details for us, but you should get your own copy of the contract between Google and UMich [PDF file] for the digitization of its collections here.
This is due, supposedly, to a FOIA request. Yay for sunshine. And if you're planning on attending any of the many sessions devoted to the Google Dig at ALA Annual, you may want to print out and annotate a copy to refer to for the Q&A portions.