That pdf from the Massachusetts Building Congress last month states that the construction of an Indoor Practice Facility is expected. Construction projects will total $900 million over the next five years, according to the materials.
Based on the Big Green Alert Blog report that “Dartmouth is pushing for a ‘hard-sided’ indoor practice facility” as opposed to an inflatable structure, this might be a proper fieldhouse. Chase Fields seems a likely site:
[Update 11.17.2012: Broken link to BGA fixed.]