IGN has posted several gameplay vids of the  new levels shown in the latest trailer. They are hidden deep in the IGN site, oddly enough, but here they are.

I think it looks pretty good, multiplayer looks WAY too hectic for my taste, but the single player vids are quite nice. 

http://www.ign.com/videos/games/super-mario-wii-u-wii-u-112718

http://www.ign.com/videos/2013/10/01/super-mario-3d-world-gameplay-double-cherry-pass-single-player This one is my personal favorite. AWESOME MUSIC.

One thing that strikes me about these levels, is how much they seem to be built for 3D. I have to imagine this started development on the 3DS, because these levels are practically hand made for 3D. 

What do you guys think?

I can't wait to get this game... Day 1 purchase for me

Too bad more people don't have a wiiU yet, I hope people buy wiiU's when this thing comes out... It really looks awesome

People on the fence to buy a wiiu or are waiting for MK8/SSB4/Zelda.... This is a reason to buy a wiiu! NSMBU is cool and all but this right here will be the best mario multiplayer! 9.9/10! (it would be a 10/10 if it had online co op)

@Mensrea.. Yeah tht music was awesome! I personally care about music very little but wen there is good music i definitely can heear it! I love that tune.

Well they were always going to make this. That's their inspiration for 3D Land.

I think we now have an in-universe explanation for Luigi's Mansion 2 multiplayer. lol.

How does the Double Cherry work? Is it like the Ice Climbers in Smash Bros where the clones have an independent AI that usually follows you precisely but will, if need be, act on its own in order to get back in sync with the player character, or are they all under direct control?

http://www.youtube.com/watch?v=mJYiIKBf8FM

As shown in the video, they mirror your movement point by point. And from the looks of things, they won't try to sync back up if you get them stuck on a wall or something like that.

@ Mr Khan: They are under your direct control so if you dont control them well you could leave them behind which I think is much better than giving them AI :)

Admittedly, the graphics on it do look pretty good, but still not enough to buy the game imo. I want to see more on X, before I decide if I'll even take my Wii-U back out of it's box.

Looks like fun. My TV forces stuff into 3d, I guess this would look good in it.