Have no idea if he'll be in the Heisminz race again, but barring injury, he'll put up some gawdy numbers. Simply because he's playing in Kevin Sumlin's system. I believe any half way decent QB can throw for 20+ touchdowns and 3,000 yards under Sumlin...and Malzahn for that matter. JFF has the added feature of almost being Nick Marshall like in his running ability.
I think what will hurt him, assuming he stays healthy and plays a full season, is the bad pub he's getting and the cloud of the autograph thingy hanging over his head. There will be so many that simply won't vote for him because of it. He'd have to be like Cam and have such a great season that he forces you to vote him in. I don't think it will happen and ESPN will pick their favorites and pimp them all the way to NY.