The trailer looked fine enough, definitely pretty good visually. We'll have to see about performances and writing though.
I think there is room for a more adult-take on A:TLA, because as much as I really enjoy the series, there definitely are some Nicktoons-y elements that cause it to grind a bit on me at moments. It's part of why I enjoyed Korra S1 when I last saw it, because it went into the world from an older perspective with less fart jokes and the like.
I am worried though about only 8 episodes, I'm interested to see what gets cut and if the pacing can keep the strengths of the original. I would hate for it to feel rushed or surface level because they can only afford 8 episodes or so.