Katie Strang tweeted this earlier today on the NHL's position:
#CBA Via email, Bill Daly said KHL has confirmed they honor agreement with NHL that NHL player cannot play there once lockout lifted— Katie Strang (@KatieStrangESPN) January 8, 2013
And Dmitry Chesnokov got a similar statement from the KHL:
The KHL also confirmed they stay by/honor their agreement with the NHL (respecting each other's contracts).— Dmitry Chesnokov (@dchesnokov) January 8, 2013
Whether or not the KHL and NHL intend to move forward with enforcing this is an entirely different story. The KHL could bar Visnovsky from playing for Slovan, or they could idly watch as he continues to play. It wouldn't seem to make sense for the KHL to start a fight over an older player like Visnovsky with little time on his NHL deal (Ilya Kovalchuk, however, different story). Visnovsky's team plays a home game at 1pm ET today against Traktor Čeľabinsk. Visnovsky is in the lineup but since the lockout isn't technically over, we can't take this as a sign of the KHL's stance on him.