http://en.rocketnews24.com/2014/09/09/scholars-confirm-first-discovery-of-japanese-sword-from-master-bladesmith-masamune-in-150-years/
Update 9/14/2014:
Here is another article from the Wall Street Journal Blogs:
http://blogs.wsj.com/japanrealtime/2014/09/12/famous-sword-re-emerges-after-150-years/
There is an image referenced that comes from the museum in Kyoto. You can go to the site, but it is in Japanese.

Image: Shimazu Masamune sword, donated by Befumon Okuda. Courtesy of Kyoto National Museum.