Well if he keeps playing like this he'll cement his place in the lineup so hopefully he'll stay as long he knows he'll get NHL ice time and not get stashed in Albany. If he does bolt, a 5th for a rental of him is still probably ok value considering out F depth at this point.
I think if he's getting consistent minutes on the Devils he'll stay. I was figuring Josefson would be better than he's been and it would have made Loktionov consider the KHL. That clearly isn't the case here. He's been much better much quicker than I thought possible. I hope he keeps it up.