from Chris Johnston of Sportsnet,

Expanded video review is being implemented in the NHL by way of a coach's challenge -- with only missed offside plays or goaltender interference allowed to be looked at again.

When those occur, the coach will signal for a timeout and specify exactly what he wants reviewed. The referee will then relay that information to the crowd and be handed a headset and video monitor at the time keeper's bench, where he can look at numerous replays of what's happened.

The final determination will be made by the official(s) on the ice -- just as umpires get to do with reviews in Major League Baseball or referees do in the NFL. In some cases, the referees will be highlighting their own mistakes.

"If there's a better call -- it might not be the call that the fans want in the building -- but if there is a better call than they are going to be empowered to make it," said Walkom. "I think our guys fully support overruling themselves in the game because they know it best serves the game. They'll take ownership of it.

"I think they'll be real good at it when it does occur."

A key aspect of the new rule is that it won't be used as a way to unnecessarily stop or slow the game because a coach loses his timeout when he makes an incorrect challenge. So you must have a timeout at your disposal to initiate a challenge -- except in the final minute of play or in overtime, when reviews will be prompted by the situation room in Toronto.

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