pre-E3 Nintendo Direct conference to showcase some of the Wii U's features prior to the actual conference. Even so, another event has been announced for tomorrow, which will feature news on upcoming Nintendo titles.
The live stream will be shown at 12:00pm in Tokyo time. If you're not sure what that converts to in your area of residence, here's a handy list containing many hourly equivalents elsewhere. The show will run for approximately an hour.
Before you get your hopes up for a Wii U price and release date, it was confirmed that the conference will only feature news for the Wii and 3DS, not the Wii U. Additionally, Nintendo of America and Nintendo of Europe have not yet announced any intentions of holding their own live streams, so these may or may not turn out to be Japan-exclusive details.
As always, you can expect to see the highlights of the event covered here if any intriguing details pop up regarding the digital sector of things.