Sounds like this one is still in the works. Here's an article from August -
http://articles.boston.com/2011-08-1...idential-units
Developer offers new details on Copley tower
Simon Property Group is moving forward with plans for a 47-story tower at Copley Place that would be Boston’s largest residential building ... the developer is trying to address the building’s impact on the neighborhood by, for example, rotating the tower to make it appear slimmer from the Copley Square side and increasing the size of a glass-encased garden with shops and community space.