According to a Twitter post from @ConciergeBoston, Pret A Manger is planning to open at South Station, with a sign at the site saying "Hello South Station: We look forward to welcoming you soon." Once it opens, the new shop will join others in Boston's Financial District (Arch Street, Federal Street, Franklin Street, and State Street), the Back Bay (Boylston Street). and at the Longwood Center. (Pret A Manger has other U.S. locations in Chicago, New York, and Washington D.C.)
The website for Pret A Manger can be found at http://www.pret.com/us/
[May 11 update: The Boston Hospitality and Tourism Industry Blog mentions that the new Pret A Manger is opening soon in the former Cheeseboy space.]
[June 5 update: A new post from The Boston Hospitality and Tourism Industry Blog states that Pret A Manger is now open at South Station.]
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[Related article from our sister site (Boston's Hidden Restaurants): Slideshow--Twelve Sandwiches from Restaurants in the Boston Area and Elsewhere in New England]