We covered most of this during our live-blog, but now you can see an exact rundown of what was said/covered in the Japanese ND.

23:00 The presentation has begun. Iwata is, as expected, wearing a Luigi hat. Luigi first appeared in Mario Bros. in 1983, the same year as as the Famicom.
23:01 This year, 2013, is Luigi's 30th anniversary, making this the Year of Luigi.
23:03 Luigi finally earned a starring role in Luigi's Mansion. Miyamoto appears w/ vacuum! Iwata hands Miyamoto a Luigi hat, making them the Luigi Bros. Miyamoto introduces Luigi's Mansion 2.
23:05 You can really see the depth in the rooms. He explores the dark with a flashlight. Enjoy the different environments in the game. The vacuum is powered-up; vacuum things.
23:06 Try using the vacuum in lots of different ways. Dark light allows you to uncover secrets.
23:07 Luigi explores lots of different, individual buildings. They each have unique features. You have to use different techniques to capture the ghosts. Boo and many others appear.
23:09 "Obaken" is a ghost dog that steals a bone, and you have to chase him down. Comic horror.
23:10 4P all-Luigi co-op in Terror, Hunter, Climber, Chaser Towers. Local, DL, Internet play.
23:11 Next game! Luigi is sleeping peacefully. Let's bother him. Do you know what this is?
23:12 It's the next game in the Mario & Luigi RPG series, which takes place in Luigi's dream. Mario & Luigi RPG 4: Dream Adventure. Summer 2013.
23:13 The next title in the Mario Golf series also includes Luigi. Normal and gimmick courses. Mario Golf: World Tour. Summer 2013.
23:14 NSMBU file select screen has a New Super Luigi U icon. New adventure starring Luigi.
23:15 New Super Luigi U to be made available for download at a later date.
23:16 Band Brothers now. Band Brothers 3DS can also play the over 9000 tracks from the DS version, now under prep.
23:17 Zelda update now. Miiverse has communities for released titles, but not unreleased. Miiverse community for The Legend of Zelda series to be opened. Official Aonuma Mii.
23:19 Donkey Kong Returns 3D under development. Screenshots now. eShop video. Summer 2013, retail and download.
23:20 Thank you for watching! The presentation is now over.