We see Gokuu struggling to fly in the trailer, so it's pretty clear that his ki control has been shot.
We know from behind-the-scenes details (provided by AnimeAjay) that:
The staff is intentionally focusing on hand-to-hand combat for the series, so don't expect tons of ki blasts. We also know that the series directors are Yashima Yoshitaka and Komaki Aya (not officially announced yet). Yashima did a ton of solo key animation and storyboards for Dragon Ball Super, and he's not really known for anything other than being fast at his job. It'll be interesting to see how the series looks at the end of the day.
Nakatsuru Katsuyoshi is back as the character designer. Nakatsuru was the credited CD for Dragon Ball Z #200-291, Dragon Ball GT, and Dr. Slump (1997). Kubota Chikashi (CD for One-Punch Man), Takahashi Yuuya, Shintani Naohiro (CD for Dragon Ball Super: Broli), Tsuji Miyako and Ide Takeo (both chief animation supervisors for Dragon Ball Super) are chief animation supervisors, so it seems like the series will be relying heavily on staying on-model to mimic Toriyama's modern style more closely. Nakatsuru himself will apparently be personally involved with animation corrections, which is something that he has generally not done over the years.
Production began at the end of 2021, a pilot was made in early 2022 to show off as a proof of concept for Shueisha and Toriyama, and then they began recruiting animators in April 2022. Animation production began in earnest in October 2022, mostly using staff from Dragon Quest: Dai no Dai-Bouken (2020) after it had finished. With the series set to be released in the fall/autum of 2024 (usually beginning in October for Japan), that means that the series will have a full two (2) years of production before the first episode is even finished. This leaves me really excited, since it definitely feels like the production staff are being given the respect of enough production time to turn in their best work.
My only realy qualm with the trailer is the hair highlights. I think that those shouldn't have been included, they're distracting and just make the character designs look busy.