Actually, yeah, I forgot that they didn't make Galaxy 2. They might indeed have something ready to go.
Tokyo EAD did make Galaxy 2 though. People have to remember that Tokyo EAD was just one studio with one team back when they made Jungle Beat and the first Mario Galaxy. After Galaxy 1 was released, Nintendo split the studio into 2 different teams. The problem is Wikipedia credits the first team with making Jungle Beat and Galaxy 1 and the second team with making Galaxy 2 and 3D Land because there was only one team before Galaxy 2. The problem is, most of the major people who made Jungle Beat and Galaxy 1 were the ones who became that second team that did Galaxy 2 and 3D Land.
That's the thing, the Second Team at Tokyo EAD is the main team that is made up of all the major people that made all their previous games and is basically the whole studio. The First Team on the other hand is just a small group of leftovers that has only made the DSiWare game Jibun de Tsukuru Nintendo DS Guide, and help Grezzo with the Ocarina of Time 3D port and Four Sword Anniversary download.
So no, I really wouldn't except them to have anything ready since the main Mario team last made 3D Land which came out Fall 2011, and the other team is way to small to even try and work on anything for an HD system. Of course Nintendo did use Brownie Brown to help get Mario 3D Land out for its Fall release last year so they might be able to do the same for a Wii U game in 2013. Of course the wild card is the is going to be Tokyo EAD's first HD game and since they love to get the most out of the Wii power, if they try to get the most out of the Wii U, that could easily result in time taking longer then they hoped.
Seriously, this is the one thing I worry the most about with Nintendo's top studio's for the Wii U. Since there's going to be a huge, basically lightyear style jump between the Wii and Wii U, if these studio's want to really show off it's power like they did on the Wii, it will result in these top games taking longer because of how much more work they'll have to put in their Wii U games. Now for Smash Bros it won't be much of a problem since Namco is experienced with HD development, but that won't mean anything again if Sakurai wants to pack the game full with as many things as possible.