I found the replay on sportsnet. It certainly isn't the worst thing I've ever seen, but he's lucky he didn't get 10 games. He was aiming for a Knight's player, but ended up hitting the ref. Had this event played out, say, 15 or 20 years ago he might not have gotten a suspension. Kane's contention that the ref did anything but his job, when he took '5 strides' toward him after the play was dead is more or less accurate. 15 or 20 years ago the ref doesn't get between the players and a fight happens. In the more civilized era of the NHL though the ref does his job and people don't fight. The later is what transpired.
At the end the day, Kane goes 'half Wilson' (you never go half Wilson!) and earns a few days off. Just as the powers that be intended it; my boys the Chelyabinsk Kartel's Kane vs. Ben Rome's Error 404 Kuznetsov sitting for 3 games to start the season.