It's this huge exposition of electronics in Los Angeles. It occurs over the duration of the third week of May, I believe. This is where new products are often shown, such as the Micro and Twilight Princess.
And I doubt this will be released any sooner than September in even Japan. Unless they're doing some secret development about which we haven't been alighted, which I'm certainly hoping, this project won't get done anytime soon. I'm just hoping they have a series of Pokemon finalized by now, and that Tajiri's ideas are still up to snuff.