He's in pain, but he hopes to be back for the next game.
Kovy's an honest guy, if he felt like he would have to be out for a long time, he'd say so. I expect, that if he misses any games, he'd only miss the Florida game, but Ilya Kovalchuk isn't the kind of player who will stay out of the lineup for long. I think we'll see him back for game #16.
I obviously didn't see the play, but since he hurt himself while trying to one-time a shot while off-balance, he probably pulled a muscle in his back or something. Unless there was a more severe injury, a couple of days of rest should be sufficient.