I know there was a native blockade discussion a week or two ago but there was an announcement of a specific threat by the AFN for train companies to shut down trains on June 29th in honor of their 'day of action.' If they do not the AFN warns that they will face blockades by individual bands.
http://www.theglobeandmail.com/servl.../National/home
Just so anybody who plans on travel by train around that time knows that might not be the best time.