I have no idea whether or not it's official that Joe Colborne has signed a contract with the Boston Bruins, but all signs point to it happening sooner or later.
This headline in the Denver Post makes it sound official, though the first line of the article says: "University of Denver sophomores Joe Colborne and Patrick Wiercioch today were expected to sign NHL contracts with the Boston Bruins and Ottawa Senators, respectively" which is kind of confusing.
Let's Go DU says it official.
Who knows? In any case, expect an official announcement sometime today or tomorrow on Colborne ending up with the Bruins.