Stormblood Launch Trailer

[Khaoticsuccubus]

I don't think it is; in trailers they tend to put a character's voice in the mix while they show a different character on screen.
For example, when we see Y'shtola getting her world f***ed up, Yugiri was speaking at that part I believe towards Hien.

I'm 90% sure it is though. The words themselves match the characters supposed personality even if the voice doesn't really match. That said the japanese voice is exactly as I'd expect her to have.

Edit: Listening to what she's saying in Japanese (which is quite different from the english one, business as usual there though lol), it seems she's mentioning something about 20 years ago and I believe she might be belittling them for fighting since then but.... well, my japanese is pretty awful so /shrug ^_^;;