Apparently the Russian Ice Hockey Federation and the KHL have already signed on for the World Cup... so unless that has changed since the last time I heard, or changes in the not too distant future, I think their participation is pretty much guaranteed... but who knows, stranger things have happened. And since I'm not a fan of this gimmicky tournament, I wish one of the Big 6 would tell Bettman where he can shove this gimmicky tournament and torpedo the whole kit and caboodle..the fallout on HF would be pay per view material.
The GM of the Russian NT (Safronov) has stated publicly that it is an important tournament. not as important as next year's World Hockey Championship in Moscow/St. Petersburg, but important nonetheless.
And given the exodus of Russian NT KHLers to the NHL + a few more next summer, you are only looking at 2-3 NT players anyway. I doubt it would be any more than that. but if the KHL changes their mind, my bet is the Russian Ice Hockey Federation will also not allow their NHLers to participate.