More after the break (including link to preview). The most essential piece of information is:
MUSE will provide a one-month preview period during January 2012 to allow librarians and scholars to discover the significant breadth and depth of both book and journal content available on Project MUSE. At the end of the preview period, January 31, 2012, search results will default to only content to which the searcher has full-text access. At this point, users will have the option to toggle the search to show all available books and journals relevant to a search, if desired.
(Currently Middlebury has no eBooks available in full-text on MUSE.)