Soundwave on 18 January 2013
Nintendo is silent because they want to give room for the third party games currently out on the Wii U a chance to sell/have all the attention, rather than having people day dreaming about games 9-24 months out.
They'd rather you just break down and buy that copy of Zombi U because you've played everything else than obsess over Zelda U or something.
That said, I think that period is coming to a close, there probably will be a Nintendo Direct for the Wii U before the month is up. 3DS already got its big Pokemon X/Y reveal, so now Wii U should got a Nintendo Direct focused on it.
