Are we counting players who weren't even in the league last year? If so, easy: Jagr.
If not, are we counting players who were in the league but injured all last year? If so, Parise.
If not, are we counting players who just had down years? If so, Kovalchuk.
As for breakout years, we will see huge production increases from JvR, Tavares, and Dustin Brown.