For me, he made a huge improvement from a year ago on offense, and at times looked like the best player on the team. I also think that getting a new coach will do wonders for him. I also feel that Kanter hung him out to dry, because of his none existent defense, and he has never played this amount of minutes. In my opinion he is still improving, and still has plenty of room to improve even more, and he will.
Biggest thing he did is he learned to take advantage of mismatches. I remember in previous years teams could guard him with scrubs (Matt Bonner) and he had no idea what to do. He learned when to overpower opponents and when to use his speed. Also saw a fairly dramatic improvement in his touch around the rim, which was something I was really worried about. He just has to put it all together now, which is on him mostly, but also on the new coach and our ball handlers.