Rumors have been blowing around in the windy Back Bay streets by their corporate headquarters for weeks. In 2002 the company was purchased for about $1.7 by three private equity firms, two of Boston, Thomas H. Lee Partners and Bain Capital, and the Blackstone Group of London and New York from the then French owners, Vivendi Universal. The publisher came back to the Boston roots they put down in the mid-eighteen hundreds. Today a deal......