SCOTUSblog analysis: http://www.scotusblog.com/2013/03/opinion-analysis-justices-...
Breyer won six votes for his strong pro-competition, pro-market, IP moderate position.
Remember that in Eldred v. Ashcroft (q.v.) Breyer wrote one of two vigorous dissents against the essentially permanent copyright terms now in force. Former justice Stevens was the other.
Stevens was also joined by Breyer in the split decision in Bilsky where they won four votes (with Ginsburg and Sotomayor) for serious restrictions on patents for software and business methods and possibly total exclusion from patentability for those arts.
In short, Stevens was a great loss and Breyer is still a national treasure. Let's hope we get more like them and fewer like Kennedy, who always seems to be on the wrong side of IP cases. (Alito, Roberts, and Scalia are very bad, too, but haven't been as consistent trying to destroy our industry as Kennedy.)