Tbh, not quite sure about the animation, looks somewhat CGI'ish to me, but seems like they understood the underlying rock & metal vibe the series has. Damn tho, I was so hyped for some of the voice actors... think choosing the wrong voices is one of the biggest mistakes the anime could make. But I'm very excited!
The trailer is amazing but is a pre-made one. It's better to wait the next one to set our expectations.
However the staff it's high tier, only the director is doubtful cause this will be his debut in this position but his work in JJK(episode 19) was very interesting. Also his storyboard here in the PV was amazing.
I believe the series will release in January of next year. The demons are pretty tricky to animate(they had to hire a specific designer for them).