According to this article and the following tweet, you can wave goodbye to Niklas Svedberg in Boston this year.
Svedberg played in 18 games last season and finished the year 7-5-3, with a .918 sv% and a 2.13 GAA.
Salavat plans to use him as their #1 goaltender, which is not a chance he would have had in Boston anytime soon, so good for him.
This does, of course, throw a small wrench into Boston's goaltending future. Luckily they have two big potentials in Malcolm Subban and Zane McIntyre; the loss of Svedberg may motivate McIntyre to go pro and forgo his final season at University of North Dakota.