Japan is pretty surprising. Let's see how it sells outside the holidays though. PS3 was never a beast in Japan anyway so Wii U selling well there isn't surprising since really it only has 1 competitor.(Sorry Xbox 360)
Europe is surprising as well but for another reason....is price really that much of an issue over there? I mean a $600(IDK what this is in Euros) PS3 sold very well at launch over there....
Wii U got dangerously close to PS3 sales in America this holiday. I think this will be its strongest market.