So Nintendo are realeasing Zelda , Mario 3D and Mario Kart within two weeks.

Which one is going to sell the most during this period?

My predictions:

Mario Kart 7: 3,2 millions

Zelda : 3 millions

Mario 3D: 2,7 millions

They will be close but I think that Mario Kart broader appeal will allow him to win it even if this is the last to be released despite way less 3DS than Wii but the 3DS will be the hottest product this christmas.

It all depends on bundles.

Mario 3D land is already confirmed so i guess will be the stronger.

Mario 3D Land 3.3
Zelda 2.2
Kart 2.8

I think overall it's going to be Mario Kart 7 but as for just this year it will be Super Mario 3D Land. It will more sales up-front while Mario Kart will likely be an 'evergreen' title.

Zelda is niche compared to those two games. Very few things can compete with Mario in terms of sales.

Mario 3D has two more weeks than Mario kart to sell, and a bundle too. Both are bigger franchises than Zelda...I think Mario 3D land will win with a small margin on MK7, and Zelda will be behind but not that far (600k from MK7?).

I think Zelda will be ahead by the end of the year, but last overall. Based on what DKCR did last year I would expect 3.5 million for Zelda by the end of the year. The 3DS just won't have a big enough user base to put up numbers quite that big that fast. I think 3 million for Mario 3D Land and 2.8 million for Mario Kart 7 by the end of the year. The overall sales will be in the opposite order.

I'll go with Zelda to be first in sales for this christmas, but last in a couple of years time

Zelda has the stronger install base, and will therefore probably have the first two months ahead. It has no chance for grand totals though.

Zelda SS 3.5 million
Mario Kart 3.1 million
Mario 3D land 2.5 million

Zelda > Mario Kart > Mario