Depends how the game goes.
He'll get booed out of respect in the beginning.
If we put up a one goal lead, people will forget about him and focus on the game.
If we put up a two goal lead, they'll go back to focussing on Kovalev.
If Kovy ruins us, the crowd will cheer him.
If I were there I'd do neither except show appreciation in a rare moment at the beginning. Otherwise, I want the Habs to, you know, beat his team, so I'm not giving him any more incentive than he already has, which is quite a bit. I'm more worried about Huberdeau. We already got burned by one Habs fan (Kadri - so knew that would happen), it's bound to happen. Ex players and fans growing up - our biggest foes. Oh and RJ Umberger.