This is a link to the full text: http://extremelongevity.net/wp-content/uploads/als_discovery...

I'm hesitant to put too much hope in this discovery. I would expect a discovery of this magnitude to be published as a full article in Nature, rather than a Nature Letter. I'm not sure of the difference in the publishing process for the two, but Letters generally come across a bit rushed and are less exhaustive than published articles (citation needed).