I don't think it was all that different, as they still relied heavily on Inside Zone-read, Duo, and Outside Zone handoffs in the run game. The only difference was they ran Duo and Outside Zone from a pistol look more than straight under center, which allows the QB to read the backside edge. That resulted in more keepers for Fields (which he looked quite comfortable doing). There was definitely more of a spread feel, though, to your point. I think that had more to do with the opponent, though, as Cincy was very stout up the middle last year, and teams like UCF gave them trouble by spreading the field and getting the ball to speedy players in space. That's why we saw more quick outs and WR screens.
The biggest takeaway for me was how good Fields looked. He seemed calm and comfortable all day, even when pressured. He made very few mistakes as a passer and threw some absolute darts. Day called out the touchdown pass to Garrett Wilson, as he was rolling to his left and still put it right through a small window, but he was completing deep outs to the opposite side of the field without any hesitation or trouble, showing a combination of accuracy and arm strength. As a runner, he made a few cuts upfield that probably didn't get celebrated because of how big he is, they didn't look quite as fast, but he left a couple defenders in the dust and still showed the smarts to slide or get out of bounds before taking a hit. The only thing people were upset about was the 4th down run he didn't pick up, but I actually think that was on Wyatt Davis, who was pulling on the play and missed the end he should've kicked out, allowing that guy to wrap up Fields at the line.