I hope it will be good too. I'm sure it will be, considering the same creative team is behind it, and I presume the art will remain as good as ever.
The only thing I'm unsure about is the setting. Does a steampunk city fit in the Avatar universe? There were echoes of it in Fire Nation controlled Omashu, and I suppose the setting has advanced by 70 years, but even so, part of the charm of Avatar's world was its feel of asian mysticism. If that's replaced by industry/technology and more contemporary culture like inner-city gangs, it could sully that feel. I'll wait and see.
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If songs were lines in a conversation, the situation would be fine.