Doesn't matter because it looks like 2014 will be Wii U's peak year. Expect it to sell less in 2015 which will land it around 16-17 mil by the end of 2016 when the next system is launched.
I actually very very strongly believe 2015 will be the peak.
Unless delays, the momentum will go throughout the year. That's just 1 simple factor.
The Wii U hasn't proven itself of holding any momentum.
It's had basically two "good" periods of sales its entire life cycle -- right at launch and right at MK8's launch and both times, sales have dropped back to a mediocre baseline within a month or two.
If MK8 can't even net you consecutive 100k+ (still mediocre, but at least it's above 100k) months in the US or a real huge hardware bump in Japan then I think the 2015 lineup is going to be largely ineffective. Unless Splatoon breaks out and becomes like some new type of Minecraft/Pokemon type blockbuster IP.