Here are my picks:

Battle Mii

And this:

New Super Mario Bros. Mii

All those minigames probably may turn out to be a free little game or something like Wii Sports was for the Wii.

To be honest anything but New Super Mario Bros. Mii....
If they were included in the package that would be really cool.

I want NSMBM I just wont play as a Mii

I really hope that pirate rhythm game will make it onto something. Also I am 99% positive that Battle Mii and Chase Mii will be released on the eventually Wii U Play or be one of the games that come free with the system.

Also about New Super Mario Bros Mii, I enjoyed the DS and Wii version, but I hope this doesn't become an actual thing for two reasons.
Reason 1: I don't want Mii's infecting Mario games, I don't like them in Mario Kart & Mario Party, and think they should only be used in Mii games. Yes I know I can choose not to play as them, but they pop out as background characters and that bothers me.
Reason 2: Although the games were fun, and I got all the gold coins in both the DS and Wii Versions the games played it a little too safe. When you compare these to the risks past Mario games took these are very uninventive game. The NSMB art direction isn't bad, but it's not particularly great. I hope the next 2D Mario looks completely different maybe a return to pixel graphics or hand drawn graphics like in Wario Land Shake it. I just think they should shake things up with 2D Mario like they've done with the 3D Mario games like in the Galaxy games and 3D Land.

The demos that best display the Wii U's unique and innovative way of gaming should be the ones that are packed in, like Battle Mii, Chase Mii, and that Pirate Rhythm game. I'm sure Nintendo won't pull a bone headed move by not including some built in or bundled game with the Wii U especially since it was ultimately Wii Sports that helped sales sore.

I sincerely hope that the first 2D Mario platformer for Wii U is NOT just New super Mario bros. Wii.. NOW WITH MIIS!!! I also hope that the next 2D Mario platformer is more original with the worlds not just having the same themes as its predecessor but in a different order. Also, instead of Miis as the third and fourth characters to play as, I would rather Mario characters like Wario and Waluigi or even two Toads like in NSMBW.

I found the two Toads to be rather boring to play as. If they just went with that, then it would be the same as NSMBWii and Nintendo would be accused of being lazy again.

I like Mii's and I think the concept of them being in a Mario platformer is charming. Same with seeing a Mii in Mario Kart, Pilotwings Resort, Wii Sports / Resort, etc. If the next Smash Bros. has a Mii as a playable character, I'd enjoy that too.

Not necessarily, characters aren't the only thing that can be changed in a Mario game but I would rather Wario and Waluigi replaced the Toads rather than Miis or any other Mario characters unless they were enemies as that wouldn't make sense.

All of them except NSMBM.

Yeah I'm kinda tired of the NSMB games...DS one was fine, the Wii version I enjoyed. But I'm done after that...make an original 2D Mario game.

I guarantee that NSMB Mii and Battle Mii will be expanded into actual games. The framework is already in place, so why would they throw all that work away?

Both of them.
That and the Zelda tech demo.

@Tendoboy: They can cancel games, you know.

Then that's just a waste of money and resources. No wonder so many companies are going under.

its called a tech demo. more proof of concept.

When the Wii was unveiled at E3 2006, many of it's tech demos got turned into actual games (Wii Sports, Wii Play). And when the MotionPlus was unveiled later on, many of those tech demos got put into Wii Sports Resort.

Then there's awesome games....like Project HAMMER.

iepect all of these to come. expect the city and zelda demo.

i mean project hammer never came out.

This. NSMB was already the most uncreative Mario like...ever, I'd rather not see a 3rd game that people will buy instead of a Little King's Story or Excitebots.

They'd be crazy to not make the tech demos a free game after Wii Sports.