I don't really believe in these expectations, but it's fun...
-Presentation will be 50-70 min.
-Kimishima, Miyamoto, Reggie, Shibata and others will be there.
-A short explanation of the philosophy behind the Nintendo Switch and the future of Nintendo (unified development, SCD, VR, design of the Switch).
-They'll speak a bit about specs and battery life, but not in great detail.
-Quick explanation of hardware components, buttons, etc.
-Quick explanation of OS, basic MyNintendo-NNID functions.
-First details for VC and eShop transition. Some kind of Nintendo Account data transfer from 3DS/Wii U to Switch or an Ambassador Program for already purchased VC titles and remasters.
-Accessories (different Joy-cons, external battery, Pro controller, car accessories, additional docks...)
-250€/250$/29.000¥ Basic and 299€/299$/35.000¥ deluxe pack.
-Basic includes console with 64GB internal storage (I can dream lol), Dock, 2 joy-cons, one joy-con grip, HDMI cable, 2 USB-C cables (one short), 2 CA adapters (one small), a 64GB micro SD card.
-Deluxe has 128GB internal storage and 128GB micro SD card, and a game.
-March 17th worldwide release (that weekend). 2+ million shipped for those two weeks.
-New Amiibo: Zelda Botw, Cloud, Bayonetta, new IP etc...
-New Zelda BOTW trailer. Worldwide launch.
-Wii U Remasters: Mario Kart 8, Smash Bros, Xenoblade X, Splatoon. Not all at launch.
-New IP for launch, and some surprise (WaveRace, Metroid or something similar).
-Super Mario 3D game for summer, Retro game announcement, MonolithSoft new JRPG teased for next year, Platinum collaboration. Super Mario Maker 2 (not a remaster) teased.
-Some third party games: Skyrim, Resident Evil 7, some EA sports or Star Wars game, Batman Arkham collection, some Ubisoft games, some Square-Enix titles (other than DQX&XI), Tecmo-Koei, Sega, Atlus, Activision, Namco-Bandai... Maybe the rumoured Dark Souls Trilogy.
-Not many post-launch games showed, but a good amount of new announcements/teasers and the promise to show them at or before E3.
-Launch games will be shown in trailer form, maybe one or two will have a short demo, but they promise Treehouse stream, hands-on, and additional Nintendo Direct stream in the following days/weeks to detail the games properly so the presentation won't be too long. Also additional ND streams on VC, online, OS and package to follow.