On September 13th, Nintendo is holding a Wii U event. Acording to an anonymous source, there will also be a Wii U conference in San Diego sometime next month. But that’s probably meant for Nintendo representatives instead of the press. I don’t know if there will be a meeting in San Diego. I mean, there’s already one in New York. I don’t see why there’s another one needed. If it’s about the development, then they could do that in Kyoto (aka Nintend HQ), or somewhere like that.
Source: My Nintendo News
Source:
http://zelda-sanctuary.net/nintendo-news/nintendo-holding-another-wii-u-meeting/