It seems like the new 3D Mario is taking aspects from BOTH 3D World and the traditional 3D Mario titles, but moreso from 64/Sunshine/Galaxy it seems - ESPECIALLY 64 considering the Bullet Bill's movement. If the goal is simply "beat the level", I'll be fine as long as the levels are expansive and have plenty to explore... And hey - No more time limit.
Not that I disliked 3D World but I can see why people like the older formula much more, I simply liked it more because of exploration and Mario's acrobatics and healthbar, but at the same time I liked 3D World's level design direction but just wish it could be expanded upon to have more branching paths and feel open ended. As odd as the comparison is, Think of Kingdom Valley from Sonic 06. The alternate paths, the overall openness it feels... I would love to see Mario levels like that, personally but that's just me. It's basically be Galaxy and 3D World's level design expanded upon.
Though I'd also love it if they just felt more like actual places akin to Sunshine. Which judging from that town, seems to be the case.