Correct me if I'm wrong, but I don't think EA has an exclusive deal with the NHL...? As far as I know, other companies have the option to make an NHL game and are actively choosing not to.
Anyway, NHL 16 was playable at E3, I stopped by its booth and watched some people play it for a bit, so I have to guess there is gameplay footage of it floating around somewhere. I haven't a clue about anything related to hockey so I wouldn't be able to break down what I saw in the slightest, but it sure looked pretty. :-)