I'd consider Dragon Quest X bigger, isn't that March?
Problem is both aren't that "big".
We've seen how "big" is DQX on Wii: It's a MMO before being DraQue, apparently.
And as much as I love Pikmin, it's pretty clear the franchise isn't even in the top 10 of Nintendo's IPs. Only two games so far, released on Gamecube...
And more than that, the two were from the ground Wii games, so not really good candidates to convey the Wii U appeal and specifics of the system.
That's one more reason Nintendo need to have a great title for march/april, and for the same reason, that's why US/EU release shedule sucks so much with Pikmin 3 on Q2.
On other topic: When was DraQue IX announced for the DS? I mean, what was the LTD for the DS in Japan at that time? Crossing this month the 10M mark should decide Squix to announce something if it's gonna be for 3DS.