I agree with you a bit, I think he did look a lot like his old self and had a lot of confidence in what he was doing in the ring, something he's lacked since he got KO'd.
Now, also, I'd like to point out his defense is a bit different than it was in the past, which is the main thing, imo, that will help him continue to be an elite fighter.
Theory: as boxers age, the first thing that goes are their reflexes, then speed, then power. Roy Jones relied entirely on his cat-like reflexes in the days of old, his natural athleticism, to dodge and duck punches. People simply couldn't hit him. Roy is now 39 years old and has lost some of those natural abilities, so he can no longer rely entirely on that alone and in a sense, he had to reinvent himself, he now has more of a Winky Wright type of defense where he becomes a shell and blocks incoming punches with his arms and hands. I think this is crucial for him to understand and to practice in the ring.
It also shows how fighters like Roy Jones and Bernard Hopkins differ (and age different). On one hand, Jones was the more athletic of the two, whereas Bernard was the more technically sound fighter. Hopkins got better with age because it didn't matter if he lost a step or two, he always relied on technique and he continued to get better at it, whereas Jones was the opposite and once he started losing some of his natural abilities he "fell off." Until now anyways.