January 2013 NPD Thread - 360: 281k, Wii U: 57k, PSV: 35k

[Moren]

I am not sure how trustworthy this old chart is, but it's the only sales data I found about the Gamecube:

[Source: Joystiq]

That would put the WiiU in a similar position as the GC in it's third month but down MASSIVELY (~500k!) on the three months period.

And the WiiU's competition is nowhere near as fierce as the GC's was.