The newest trailer as well as gameplay demo has set a lot of standards for me. Especially the music. I'll go over the elements I saw and give my observations

HUD: it looks rather simplistic, which honestly can be both a help and hindrance. I feel indifferent about it.

Modern/apocalyptic sonic stage: it looks really cool, even though the HUD is not dazzling, the graphics certainly are. I love the design.

Classic/not green hill zone: the boss goes from predictable to absolutely awesome, again, loving the animations and graphics.

MUSIC: I'm not sure how to feel about the modern stages music, but the classic boss music fits and actually feels like it belongs, rather than being chip tuned.

The Avatar: it looked....surprisingly great, and notice a track I didn't comment on in the music category? The track used for the avatar stage sounds absolutely fucking beautiful. A vocal track as a stage theme? It's so good, I love it.

The villains: two thirds of them should be good guys, why're they evil again? The new interdimensional Midna the Hedgehog looks good tho