Visually and as a gaming experience, Mario Wonder does not look like a significant upgrade over the NSMB series. Aesthetically, the backgrounds still look lifeless and dull, the world themes shown off in the Direct are completely generic (Plateau! Desert! Snow! Clouds! Swamp! Lava! etc.), and while it's nice that the characters and enemies have some new animations, it's a minimal upgrade at best and just plasters a few frames of 'zaniness' onto otherwise rather dull models. There's also no cohesion or identity to the visual style: what's the point of setting the game in a new Kingdom if virtually nothing looks different in practice or reflects the themes of that kingdom? Why are the annoying talking flowers the only discernable addition to the game related to flowers in the flower kingdom? What does an elephant or a drill or blowing bubbles have to do with flowers? Considering Mario's history with flower power-ups goes back to the start, you'd think they'd be able to come up with something thematically specific, but instead it's just stuff being thrown at the wall. Compare to Retro's DKCR games, which both have a specific cartoonish style with a ton of background movement and interactivity, and in comparison Mario Wonder looks sterile and discordant.
The same looks true for the gameplay: the wonder seeds are not doing anything which didn't exist in previous games by having a gimmick section after going down a pipe, or individual levels based around a one-off mechanic. The only significant change to the gameplay is the addition of badges, which so far doesn't look like it will have a huge effect on things. Fundamental, revolutionary changes are going from Mario 1's L>R linear progression to Mario 3's forward and back, up and down, plus the addition of the world map, to Mario World making the game less about finishing levels and more about finding exits and opening up the entire world (hence the name). The NSMB series was a step back from the freedom of SMW with nothing new to fill in for it, and the same looks to be true for Wonder. Nintendo's level designers are good enough that I'm sure the game will be fun but once the artificial hype has quietened, Wonder looks like a 6/10 game and every bit as stuck in the past as its predecessors.