We've had the threads about the Smash Bros. tournament, the Live Threehouse streaming, but I think it'd be better to have a clear look at the whole situation in an unique thread
http://e3.nintendo.com/#2014/
More detailed infos about the Nintendo Threehouse: Live @ E3 streaming
If anyone wants to contribute with some more infos, especially if in a screen form, don't give me a death stare like Luigi and feel free to post them, and I'll update the OP.

http://e3.nintendo.com/#2014/
Nintendo goes Live @ E3 next week with four big events that deliver real-time fun directly to fans. Get ready to enjoy the years biggest video game convention live from anywhere in the world.
On June 10, Nintendo will air the Nintendo Digital Event at 9 a.m. PT via http://e3.nintendo.com. Fans will enjoy breaking news about great gaming experiences on the way for Wii U and Nintendo 3DS in 2014 and beyond.
Immediately following the Digital Event, Nintendo Minute: Live @ E3 offers a post-show recap packed with even more game information.
Later in the day on June 10, Nintendo will broadcast the Super Smash Bros. Invitational tournament. Super Smash Bros. fans can tune in to watch 16 highly skilled players compete in Super Smash Bros. for Wii U. The event starts at 4 p.m. PT with live-stream viewing on Nintendos Twitch channel at http://www.twitch.tv/nintendo.
Finally, fans wont want to miss Nintendo Treehouse: Live @ E3. During all hours of E3 on Nintendos Twitch channel (excluding the Super Smash Bros. Invitational event), members of Nintendos Treehouse will be live-streaming exclusive game demos from the Nintendo booth on the show floor. In addition to demos, Nintendo will deliver the latest game reveals, plus visits from developers like Shigeru Miyamoto. The unscripted three-day event will air June 10-12, providing an insiders look at the Nintendo experience at E3, filled with surprises and unexpected moments.
More detailed infos about the Nintendo Threehouse: Live @ E3 streaming
Treehouse Live will broadcast:
Tuesday, June 10: 11:35 AM PT 4:00 PM PT
Wednesday, June 11: 9:15 AM PT 6:00 PM PT
Thursday, June 12: 9:30 AM PT 5:00 PM PT
If anyone wants to contribute with some more infos, especially if in a screen form, don't give me a death stare like Luigi and feel free to post them, and I'll update the OP.