The newly released 30-second commercial for Tales of Berseria in Japan mainly features the game's main protagonist, Velvet.
The commercial also features Velvet's 2nd tier Mystic Arte, Zeppa Messhougeki (絶破滅衝撃). It seems to be the same as Kyle Dunamis's (Tales of Destiny 2) Zeppa Messhougeki, but it differs on the 4th kanji.
Note that the one Velvet calling "Brother" is Arthur/Artorius, and though she calls him that, they're not actual siblings.
That said, I'm not sure if this is the official character commercial for Velvet. It definitely isn't labeled as such, as it's just named "game announcement" commercial. Given its length (the character commercials are usually just the 15-second ones) and that title, it most probably isn't her character CM just yet.