This is great! Of course, many of us knew he'd be working hard in the off-season to improve. I hope he has an expert to help him learn reading defenses faster, too. I'm sure he does, but I'd like to know who he has doing it. Granted, I don't know how one teaches that rather than just experiencing it and learning from that.
I also hope MM modifies the offense to fit Dak rather than trying to force Dak into a different offensive mold. In any case, I hope he and the receivers get together a lot after the draft to practice being on the same page and get used to each other at full speed.