haha i thought i didnt see a tailWrong. Compare it with this. http://www.mariowiki.com/images/d/d7/CometMetal.png
The entire middle of the coin is only a giant star, not a falling star. It's a star coin, even if it's design is a combination of the comet medal and a star coin. But this isn't NSMB or Galaxy, so it would explain a design change for star coins. They are using the team that made Galaxy to make it after all.
it should also have at least 4 playable characters,like sm64dsA game with Super Mario Bros 3, World and Sunshine themed levels? Add a NSMB, Super Mario Land 2, Super Mario 64 and Mario Galaxy styled level, and it would be awesome.
Oh, and I just wrote an article about what the game shouldn't/should have:
http://nintendo3dsfans.com/WhatSuperMario3DSShouldandShouldNotHave
3D Shy Guys: PLEASE PUT 'EM IN.
I'm quite excited over this though. Paperyoshi brings up a good point about multiplayer too... will there be any multiplayer modes or anything? I would like to see some Luigi action.