Hola amigo, I remember you. Welcome back to the forums bro. =)
I've had the same concern since the Wii U was announced, but quite a few people have been assurin' me all backwards compatibility capabilities will be there, even wi-fi 'n such for multiplayer. Ninty has also been relatively adamant in that their backwards compatibility will have everything in tact and playable, which I assume means wi-fi junk too.