Rask still will be a restricted free agent next summer unless there's a rule change in the new collective bargaining agreement
The 25-year-old Rask started 22 games this past season for the Bruins, again serving as the backup to Tim Thomas. Rask went 11-8 with a 2.05 goals-against average and a .929 save percentage.
Rask long has been projected as a rising star. He supplanted Thomas as the starter in 2009-10, but Thomas regained his position the next season and remained there.
Rask, though, is in line to see a significant increase in playing time in 2012-13.
Thomas told Bruins officials earlier this month that he doesn't plan on playing this season, and the team has said it is proceeding as if he won't be back this season.
Information from ESPN.com's Pierre LeBrun and ESPNBoston's James Murphy was used in this report.