"Beyond the news that will be communicated through Nintendo Direct videos in the run up to E3, at the show itself we're hosting two smaller events on Tuesday morning before the LACC opens instead of just our traditional one event," Nintendo said. "A media event and a partner presentation will both occur that morning," which is when the press conference would traditionally occur.
The media event will take place at Nintendo's E3 booth before the show, allowing "a small group of media" to play new games. Meanwhile, "at the Nokia theater we'll meet with business partners (retailers, publishers, analysts, etc.) from the NOA territory and discuss our plans for driving the business and providing tailored information that this group finds useful to their operations."
Yes, that's right. Nintendo is still renting out the Nokia Theater, and just putting on a smaller show there. That suggests that either this plan was conceived very recently – after the company had already booked the theater – or that Nintendo is going to try to wow its smaller, focused audience with a big show.