From what I've heard so far, the A button style for the characters work in a totally different way than we've ever known, while the B button style works like the normal artes button that we've experienced in other Tales games (Directional Button + B button = arte). The scans above further explain this "new" system using the A button.
Imagine it to work like this: the artes system for the A style works in a tier-like system. The first time you press the A button, you perform the arte(s) that require 1CC. This then allows you to perform the artes available that require 2CC. As you can see, there are four artes available for that, and can be performed by using the analog stick together with the A button. The next tier of artes can be performed once you have performed 2CC artes, and so on. Somewhat better scans can be found here: Scan 1 | Scan 2
The scans above show us some images of the characters' Groovy Chat expressions. Aside from the super-deformed illustrations, normal "cut-ins" of the characters will also be included. Other scans include a glimpse of everyone's status arts (here and here, save for Richard), their battle victory poses and a few new scenes from the anime opening (here). Higher quality scans of the chat illustrations can be found here: Scan 1 | Scan 2. Other new scans (that just summarize the info revealed before) can be found here.
A745 (or Abby, as most people call her) is the founder of Abyssal Chronicles. She is currently a doctor, but that doesn't stop her from showing her love for the Tales of Series. She loves potato chips. A lot.